Something weird in my phone, can you help me guys?

I recently updated to lollipop 5.1.1 from 5.0.2 I noticed there was an app named "installer"
I can't post a screenshot yet,I'll just describe it, how it looks like. The icon is like a blueprint

Then when I tried to tap it, the message was "no applications available on memory card" with a black background

I want to uninstall it but I can't, please help me thanks

My phone is xperia z c6602 if you want to know