A sophisticated phishing attack is racing across the internet, and may already have hit your inbox.

The definitely not-legit email disguises itself as an official message from Google alerting you that someone wants to share a Google Doc with you. Notifications of this sort are common and often wouldn't raise an eyebrow.

However, clicking through this particular link and taking the requested steps will open up your inbox — and potentially everyone on your contact list — to an as-of-yet unknown attacker.

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And, like we said, the link looks real — complete with a little "Open in Docs" blue box.

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Just how widespread is this? Numerous reporters at Mashable have received the same phishing email, as have students at Columbia University— as a warning email sent out by a member of the Philosophy department shows. The scam may have even hit the Capitol.

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Google confirmed that it is aware of the problem and is looking into it.

According to one Reddit user, once a victim clicks on the fake Google Doc link, he or she is taken to a real Google page prompting you to select an account. After that, they are taken to a new page asking that they allow "Google Docs" to access the account.

If you click "allow," the attacker can access your account. And all your contacts will likely soon receive a fake Google Doc invite from you.

So, how to tell if that latest Google Doc your friend shared is real or fake? Thankfully, there are a few tell-tale warning signs. First, real Google Doc invites look different than the recent fake. Here's a legit one for comparison:

Notice the Google address at the bottom? And the box border formatting? The fake Google notification doesn't have that.

Second, expand the dropdown option in the menu bar next to the sender's name. Below is a real Google notification for a shared Google Doc.

Lastly, the spam email is also addressed to "[email protected]," which is an account with the disposable email service Mailinator.

What to do?

If you did happen to click on the malicious link and allowed attackers into your account, you can revoke that access relatively easily. First, go to your Google permissions page. There you will find a list of all the apps that have account access. One app, titled Google Docs, is the offender. Revoke its permission immediately, and then change your password.

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So now that you know what's up, pay extra attention to any Google Docs coming your way. And, well, to anything asking you to click a link and enter your password or share account permission.