Android Malware Question

For the past few weeks, I have been getting a notification that my "Facebook session has timed out. Please sign in again." My Facebook app works just fine, which makes me think that this isn't Facebook, but some sort of malware. The notification picture is also questionable, as it looks like a pixelated and cropped Facebook logo. If you tap on the notification, it opens a form where you would enter your email and password.

Lookout and Avast don't pick up anything. I have a Samsung Stratosphere with Android 2.3.5. I'll post a picture as soon as I get one.