What is "ChocoEUKor.apk"? I have some real worries about it.
This package contains Korean fonts. If you don't use it you can uninstall it as it will not have any impact on your system's functionality.
it sounds like a type of spyware you might have got this file if you downloaded and file over the time that you started to see it don't worry just run a quick scan of your whole computer or just that file and you can then see if it is a virus or spyware then if it is remove that file compleatly from your computer then carry out a full whole computer san and it will have been removed