Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbeec14c87f8ed9…

MALICIOUS

PDF

36.1 KB Created: 2020-03-30 03:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b3cbe3a18b8b349ca3c5d0aa070d4ba4 SHA-1: fb06b1b5f65953becf09bdae56c3b5ccf4c76b91 SHA-256: cdbeec14c87f8ed9d0aa9bc3efdfe28f94c8d88b07824254948501f6948fcc53
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files across multiple domains. This indicates a link farm or distribution mechanism for potentially malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is largely unreadable binary data, but the presence of numerous external links is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://www.byronbayhealthycommunication.com/uploads/1/3/0/4/130476784/130476784.html#actividades+con+numeros+decimales+para+imprimir
    • http://realestatelearningnetwork.info/uploads/1/3/0/7/130775282/boxuxawugumeroz.pdf
    • http://www.integratedconsultingsandeventsolutions.com/uploads/1/3/0/5/130544702/sexofivimef.pdf
    • http://jenggotmerah.com/uploads/1/3/0/3/130313363/fuzavatitujir_kewako_geguvewugisiz.pdf
    • http://74-123-72-101.mgwnet.com/uploads/1/3/0/7/130739786/nadukokiguniriji.pdf
    • http://claireandbeyond.com/uploads/1/3/0/6/130622059/8495992.pdf
    • http://allyourteeth.com/uploads/1/3/0/2/130270738/ninuvuwid.pdf
    • http://larin.be/uploads/1/3/0/5/130588388/472a874.pdf
    • http://westernenergy-rd.com/uploads/1/3/0/2/130271190/renaforulatovi.pdf
    • http://statcnaservices.com/uploads/1/3/0/6/130621201/nenibere.pdf
    • http://bestofhealthandwellness.org/uploads/1/3/0/2/130288751/3ff87e42a.pdf
    • http://gothrivewithcbd.com/uploads/1/3/0/6/130605218/7776000.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_off00006281.bin
a27255453e2bdb29c73fb67df88dc88b479aa4bc1a3d01e95cf56e7faf212f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6281 8476 bytes

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