Malicious PDF — malware analysis report

Static analysis result for SHA-256 28007fcc3d89807b…

MALICIOUS

PDF

38.0 KB Created: 2020-04-05 13:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9a93ce1da37a5805387815429b805cc3 SHA-1: 337054752e08baa35a72c779dd40c7f3f0a1d945 SHA-256: 28007fcc3d89807baf3d871907b94079a8b200938982f0c8f2ea67e127e3711a
92 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution mechanism. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent. The document body itself is largely unreadable due to encoding issues but contains a URL that is also listed in the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irvinelawcenter.com/uploads/1/3/0/7/130775865/130775865.html#intencion+comunicativa+de+los+textos+expositivos
    • http://night-blocker.com/uploads/1/3/0/2/130288549/mevozuxu.pdf
    • http://chickhenning.com/uploads/1/3/0/8/130874154/3822050.pdf
    • http://webografix.ca/uploads/1/3/0/5/130590436/ribarepipokagejefofa.pdf
    • http://platsolutions.com/uploads/1/3/0/5/130550706/turejelu.pdf
    • http://abavs01.service.dmt.dk/uploads/1/3/1/3/131380591/0089d7f36df3.pdf
    • http://spumcjonesboro.com/uploads/1/3/0/5/130551143/mewavakepara.pdf
    • http://jackrodenburg.rocks/uploads/1/3/0/9/130969437/4607060.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000616c.bin
eec970720a8684df5351ec645aa070c6b4db46afcf6646842e572bd710362d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 8408 bytes
font_01_sfnt_off00007ffc.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFC 2616 bytes

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