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So, the short answer is "no". It's possible that something else changed on the page, or something happened to boost CTR (a seasonal change, an outside event that increased product interest, etc.). In GWT, you can drill down and look at CTR on a keyword basis. Take it with a grain of salt, but essentially you need to segment. What pages are the new clicks landing on? What specific keywords are driving traffic to those pages? Have the rankings for those keywords changed? Actually load up those queries - did something else on the SERP change (a new feature, a competitor's site changing, etc.)? Also, why are impressions down 17%? It's possible you lost ranking on some keywords, and those particular keywords just happened to have low CTR, while you gained ranking on some higher CTR keywords. Odds are, this is a more complex picture than just a movement in one or two keywords.

Thanks! I was curious all of my competitors 'best links' (when looking at OSE) seemed to be footers as well.

I have the same issue