Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a56ee543753c11e…

MALICIOUS

PDF

38.3 KB Created: 2020-06-19 03:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f6cc613c237f08a47342e3e6f12ff87 SHA-1: abba20e989d6a2d6acde769795543b9f6aac4d38 SHA-256: 5a56ee543753c11e3781a07b66e0762c7fc8edab015043df91469171ef2825d0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the structure suggests a link farm or redirection mechanism, possibly to distribute malware or engage in SEO spam. The presence of numerous unique URLs points to a coordinated effort to host content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://joesplan.org/uploads/1/3/1/4/131453944/131453944.html#significance+of+the+study+example+pdf
    • http://djtphotography1.com/uploads/1/3/0/6/130604575/lukurezobo-dilij.pdf
    • http://lighthold.org/uploads/1/3/0/7/130739489/1773314.pdf
    • http://multihulllift.com/uploads/1/3/0/7/130739726/tafenegebipidesod.pdf
    • http://stickitin.us/uploads/1/3/0/4/130476359/zesuxovupasodiw_pelaborasi.pdf
    • http://thrivingrootsfarm.org/uploads/1/3/0/4/130488512/surideb.pdf
    • http://mail.allaboutoilstore.com/uploads/1/3/0/6/130640059/bopomi.pdf
    • http://mail.buildingblocksplaycenter.com/uploads/1/3/0/5/130588529/rinixegiba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005821.bin
19a786b95abd333e7703e34250ba43674937af2a6e3ad157907d6fb41ef6b2e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5821 5628 bytes
font_01_sfnt_off00006b27.bin
d7924f2840474a65d5218406ffb182d79b73e35cf331cb1efe17b7104e1d0a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B27 9872 bytes

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