Malicious PDF — malware analysis report

Static analysis result for SHA-256 501702f0dd7c9f93…

MALICIOUS

PDF

37.8 KB Created: 2020-04-06 14:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0e3514ce131a00504712b2d95fd7715 SHA-1: 01b52108e061c70ca537310708abece768db975b SHA-256: 501702f0dd7c9f931290d3837c93aa78c05209abb19324c0a80953fc22e8ccc3
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to distribute malware. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is largely unreadable binary data, but the sheer volume of external links points to a malicious intent to redirect users to potentially harmful 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://christinabeautyparlour.com/uploads/1/3/0/7/130739084/130739084.html#los+10+correctos+minsal
    • http://badrep.info/uploads/1/3/0/7/130739827/daduruviwok.pdf
    • http://hoozenconsulting.com/uploads/1/3/0/7/130776499/9841b1a83d2b.pdf
    • http://aravahouse.org/uploads/1/3/0/4/130436207/f03ed.pdf
    • http://mikehenneberger.com/uploads/1/3/0/5/130590224/3f4f5e1f6a2d01c.pdf
    • http://alexjanderson.com/uploads/1/3/0/2/130291350/furotofo.pdf
    • http://coloursmobilespa.com/uploads/1/3/0/4/130489143/gedowubepavu_zawupaduduj_menoruzop.pdf
    • http://brazilnetworkday.nl/uploads/1/3/0/4/130489162/zepirezowe_rajokesogowum.pdf
    • http://koernerpark.com/uploads/1/3/1/4/131482881/jaxilij.pdf
    • http://bodyprecisionfitness.com/uploads/1/3/0/3/130313088/129461.pdf
    • http://clearbrightfuture.org/uploads/1/3/0/3/130323552/jumuverazikufa.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_off00006b24.bin
325072a65ec6f42da77848c793dab07d71bdb00857fd52f4e806e0229358a9c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B24 8880 bytes

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