since you only showed four strings, it's hard to know whether they are the bottom four or the top four.

I checked out the tab and:

-----------------------------
-------7---------------------
-------7---------------------
-------7---------------------
-------5---------------------
-----------------------------

this is just a Dmajor. and:

-----------------------------
-------5---------------------
-------5---------------------
-------5---------------------
-------3---------------------
-----------------------------

this is Cmajor. nothing fancy :)