Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e4c1a941a628d5…

MALICIOUS

PDF

30.2 KB Created: 2020-04-14 06:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9739b24ea167d6e845bb1216e8c31660 SHA-1: 1c1a70230e7992de65bdfbd17212ad489c0e4478 SHA-256: c3e4c1a941a628d55d8de267c6551a32bf1e1f9e1fbbcf24ec3d2dd6f6c796ae
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDFs hosted on various domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a tactic to drive traffic to these external sites, potentially for SEO manipulation or to host further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://caliberracing.net/uploads/1/3/0/7/130739967/130739967.html#express+dress+pants+guide
    • http://igcmz.org/uploads/1/3/1/4/131407035/9171260.pdf
    • http://gabygarcia.net/uploads/1/3/0/4/130435732/1383075.pdf
    • http://thedenabilene.com/uploads/1/3/0/5/130588701/2a9591701.pdf
    • http://friasgetaways.com/uploads/1/3/1/3/131379629/wawijesokex.pdf
    • http://sarikagupta.com/uploads/1/3/1/4/131483155/bekazop.pdf
    • http://muzemondaze.com/uploads/1/3/1/4/131407197/8227786.pdf
    • http://bckodalychoir.com/uploads/1/3/0/3/130323161/18146b684981a77.pdf
    • http://socmedpro.com/uploads/1/3/0/7/130776589/pumuzipolikinu.pdf
    • http://empatheatre.net/uploads/1/3/0/7/130775584/2356176.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_off00005054.bin
6f90c4baf6d3460f2ad68c4fe119ead6d6b494141e4dfbaa5cc2b983ec40f778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5054 7388 bytes

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