
Evilserran |

"He gains a +2 bonus on Bluff, Knowledge, Perception, Sense Motive, and Survival checks against creatures of his selected type. Likewise, he gets a +2 bonus on weapon attack and damage rolls against them. A ranger may make Knowledge skill checks untrained when attempting to identify these creatures"
It says attacks, so CMB would apply, it does not say anything about CMD, so i do not believe it works there.