This app is part of the seed and there aren't found similar apps on marketplaces

MD5	Package Name	Fingerprint	Source	Detection date
b9c3d2c5ae196c2ca56d9662767d2479	com.zgnckzn.jpgrammar	B30F52936FC0F014E3105CF6A413238E	virustotal	2013-09-25	View on Virustotal