Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac08a0585e509c07…

MALICIOUS

PDF

33.0 KB Created: 2020-05-18 06:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c192cb36d21ece59570d6818cf2d7ad2 SHA-1: 092e0cf66adc3c0fab8c67b85fa4f68c453efaf2 SHA-256: ac08a0585e509c076dde1db2f454b1b5a99a1290884e7b32a6a543acbf8c01d8
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO spam or to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains a reference to 'ajax php mysql form' and the authoring application 'wkhtmltopdf', suggesting a web-generated document designed to appear as a form or informational page, but which primarily serves to redirect users to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ameenahsan.in/uploads/1/3/0/5/130589279/130589279.html#ajax+php+mysql+form
    • http://soltricityonline.com/uploads/1/3/0/4/130488875/621c21e.pdf
    • http://ontariomotorcyclelaw.com/uploads/1/3/0/7/130775374/zuxuroneg-xurisubu.pdf
    • http://rugbyid.com/uploads/1/3/1/3/131380606/1840158.pdf
    • http://givingbackglobally.com/uploads/1/3/0/5/130543848/37278b.pdf
    • http://creativeconsultingsolutions.org/uploads/1/3/0/8/130814227/3e46c.pdf
    • http://microsofttempejllproposal.com/uploads/1/3/0/7/130775551/nuseso.pdf
    • http://studio-backstage-paris.com/uploads/1/3/0/3/130313555/9001479.pdf
    • http://zoelle.net/uploads/1/3/0/9/130969997/3122745.pdf
    • http://power4lifenow.com/uploads/1/3/0/4/130488396/d915466b2d.pdf
    • http://clickfourhelp.com/uploads/1/3/1/8/131872286/8562076.pdf
    • http://kokoandfriends.com/uploads/1/3/0/4/130478868/ca7dd8b5e993.pdf
    • http://scribblesandwhispers.com/uploads/1/3/1/3/131380438/jetixe_xubiribox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051c1.bin
565584b6efbdbc073dbfa74f79487574ef3d00ce3db0515d1a55bed24e2e6b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C1 11584 bytes

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