Can an application for Social Security benefits be withdrawn?

Yes. An application for benefits can be withdrawn within twelve (12) months of the filing date and if you are under Full Retirement Age.  This process is permitted only once in your lifetime and, upon approval, all benefits received prior to the withdrawal of application are due in full. The individual will need to complete Form SSA-521 to begin the process. 

Reference -- https://www.ssa.gov/planners/retire/withdrawal.html