Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3e1592e0513834…

MALICIOUS

PDF

38.0 KB Created: 2020-04-18 12:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31f5f0207ccc2ccda44dab571d7e3d23 SHA-1: aa7034734cbf40ed9f37d46bb9c34c1098451903 SHA-256: af3e1592e0513834164470e55081c6bab2a64c79e6a270ab488aeaeac7ef2350
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This suggests a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of external links indicates a high likelihood of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ebmccallanbuildingltd.com/uploads/1/3/1/4/131454098/131454098.html#perfect+dumbbell+chest+press+form
    • http://mallardx.com/uploads/1/3/0/5/130540504/9676853.pdf
    • http://vistareal.com/uploads/1/3/1/3/131384568/wegitovurage.pdf
    • http://recoverwisely.com/uploads/1/3/1/0/131070207/7454756.pdf
    • http://huntercopp.com/uploads/1/3/1/3/131379590/cb7a3c5b9.pdf
    • http://enrtwinz.online/uploads/1/3/0/5/130589237/wesugipeb.pdf
    • http://protectohiochildren.org/uploads/1/3/1/1/131164499/katotumosi.pdf
    • http://locomotionandcontrolslab.com/uploads/1/3/0/4/130475918/66453c3f0f1.pdf
    • http://distancelearning-today.org/uploads/1/3/0/5/130551279/3c839e8f3e.pdf
    • http://votect2016.org/uploads/1/3/0/4/130483886/1786439.pdf
    • http://cicadacollection.com/uploads/1/3/0/7/130738998/1325531.pdf
    • http://chandlerdoodles.com/uploads/1/3/1/3/131384606/3155357.pdf
    • http://wheelerldealer.com/uploads/1/3/0/7/130739032/dibabuw.pdf
    • http://huntercopp.com/uploads/1/3/1/3/131379590/cb7a3
    • 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_off00006d3e.bin
a57da6e39f5c9088710d5ffa770ea5357974ec168c9c45de1d30430db49fb96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3E 7892 bytes

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