Yes, it is dust/oil on the sensor, but be careful!
I am a pro photographer and my new Canon had a couple of these smudges. I actually think yours looks more like a tiny speck of lubricant than dust. New cameras sometimes throw around a little extra lube inside until they are broken in. Do a web search on how to clean the sensor and read thoroughly concerning the proper procedure. You could really mess it up big time if you do it wrong. I know a lot of photographers who had MORE dust after they were done than before they "cleaned" it. I personally just try to fix them in Photoshop until they become unmanageable and need to be cleaned. If only dust were confined to the world of analog like I originally thought when I made the switch.
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