Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc5fff99be21d67…

MALICIOUS

PDF

38.5 KB Created: 2020-03-26 13:16:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d450b23ccef82a0e55e1f63d0fa738fe SHA-1: 8f56e2251dffcdea9e0e9cb9c43ebe6bc69ecb27 SHA-256: 7fc5fff99be21d67d88e8a115f9787ea3082892385c31f9647d18b6785caa24a
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of potentially malicious or low-quality content hosted across multiple domains.

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://teshuvah.international/uploads/1/3/0/5/130589040/130589040.html#propiedades+del+campo+access
    • http://stylebunnie.com/uploads/1/3/0/5/130588597/xetowavam-kajolu-dibixabowinasa-jafup.pdf
    • http://marijuanacultivationconsultants.com/uploads/1/3/0/6/130639495/8441905.pdf
    • http://andinclusion.com/uploads/1/3/0/2/130291874/1237754.pdf
    • http://millark.net/uploads/1/3/0/7/130739379/kawewajasidu.pdf
    • http://partnerscapitaledu.com/uploads/1/3/0/6/130621969/xojezapobagow-wugowatuponim.pdf
    • http://bloominggiggles.com/uploads/1/3/0/9/130969835/jusixuborifep.pdf
    • http://garciacorpas.com/uploads/1/3/0/6/130639910/zetowe.pdf
    • http://stringsoil.com/uploads/1/3/0/3/130323401/d8843b729b.pdf
    • http://budgetdieting.nl/uploads/1/3/0/5/130551718/nadinix.pdf
    • http://iamguitarwalker.com/uploads/1/3/0/7/130738751/dc8a0d.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_off00006cc9.bin
48e41e6e94ac838bc2c690ae808dd0104bcd448054f1f8b1de7914a301df1e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC9 8448 bytes

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