Open SharePoint site in IFrame

Good Morning Everbody ,

i have aspx page that have Iframe , and it want to view document from SharePoint on that IFrame , but i am getting the below error : 

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Clik here to view.

<iframe name="preview" src ="http://spsrv2013/attach/518071312484955.jpg" width="100%" height="700"></iframe>

is there any way /workaround to view the SharePoint documents in IFrame.

Thanks,