Default keylogger.txt on internal memory

Hi everyone,
i recently purchased Huawei Ascend Y300 and everything is great, but few days ago i noticed a problem while trying to delete some stuff from it (music, docs etc). On internal memory i have a file called keylogger.txt and it remembers everything that i ever typed on the phone, all from skype, to whatsapp all the way to my passwords. I have never installed an app that is not in the market or did anything that would compromise my phone security.

I would appreciate if someone got the time to answer me why this file is on my phone and what should i do...

thank you
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