Your "MAC originated" dd is seemingly not able to run on the iPhone.
See this related though oldish topic:
https://discussions.apple.com/message/3226337
Most probably you need to recompile it, including support for the *whatever* CPU the iPhone uses, see:
http://www.everymac.com/systems/apple/iphone/iphone-faq/iphone-processor-types.html
or some specific "for iOS" settings.
Possibly the "-arch armv6" as in here:
http://theiphonewiki.com/wiki/Toolchain_2.0
is needed
See also here:
http://techtalktone.wordpress.com/2011/12/05/testing-your-ios-apps-on-a-jailbroken-device-2/
See if - for any reason - any of these ddrescue (which is not dd) builds do work:
http://tinyapps.org/blog/mac/200808220700_ddrescue_for_mac_os_x.html
(seen frm the above it is not easy-peasy to recompile on a Mac)
jaclaz
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