Malicious PDF — malware analysis report

Static analysis result for SHA-256 626f899ad06eeb77…

MALICIOUS

PDF

41.1 KB Created: 2020-04-02 05:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 27537d965883fd3c72a4b1be37a3d5ed SHA-1: c281febe11dd89452552e88e3de5fb581826888b SHA-256: 626f899ad06eeb777263c3444a568b3682f1ba7fd65bb50d9326b9173601de46
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution point for further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs supports a pattern of redirecting users to potentially harmful sites.

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://michaelpamram.com/uploads/1/3/0/5/130539338/130539338.html#uniden+bearcat+bcd325p2+scanner
    • http://daviscandleco.com/uploads/1/3/0/8/130813317/buxoga.pdf
    • http://terranovamd.net/uploads/1/3/0/4/130476150/3212995.pdf
    • http://evq.ro/uploads/1/3/0/6/130604401/dibojarasalemukex.pdf
    • http://risingsunproduce.com/uploads/1/3/0/8/130814877/jojikogo.pdf
    • http://positivelightmedia.studio/uploads/1/3/1/3/131380487/tawal.pdf
    • http://suplittleton.com/uploads/1/3/0/9/130969990/xamanebeterixefel.pdf
    • http://thespartanpursuit.com/uploads/1/3/0/5/130551330/021708ff1ec.pdf
    • http://thefitboxhouston.com/uploads/1/3/1/3/131378968/5059298.pdf
    • http://flexmobilemarketing.com/uploads/1/3/0/6/130604397/dd7f507fe9.pdf
    • http://pedzzzs.com/uploads/1/3/0/7/130775730/327759cc5f6f24c.pdf
    • http://claytongatehealthandmassage.com/uploads/1/3/0/7/130739895/d4f7d.pdf
    • http://steamedpotatoes.com/uploads/1/3/0/3/130379528/a8dd387adc8.pdf
    • http://woodwerx.net/uploads/1/3/0/6/130640104/7615519.pdf
    • http://bcummings4.com/uploads/1/3/0/3/130379351/6574945.pdf
    • http://luxliquidator.com/uploads/1/3/0/2/130289693/f735e8a.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_off000074d4.bin
606da7409ca2a4987da5a140b5688d83abe5f1b09538e2ca9d8367f730f77428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D4 9064 bytes

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