Malicious PDF — malware analysis report

Static analysis result for SHA-256 466f0306072a0eb9…

MALICIOUS

PDF

107.3 KB Created: 2020-04-26 07:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 28f5853d62020a19e1090e8b6398410b SHA-1: eb6c19bc12974b5bc75f8aca64048c330092f0ac SHA-256: 466f0306072a0eb9b993ba1508a205b13ea52642ef3b4ad2983b44ec4bf986d8
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be directing users to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://marshall-designs.com/uploads/1/3/1/8/131856317/131856317.html#assertive+communication+exercises+pdf
    • http://highqualityconstructionnm.com/uploads/1/3/0/5/130551775/tubojotejemuzulemi.pdf
    • http://hhbymaggie.com/uploads/1/3/0/3/130379458/jajixuzesadam.pdf
    • http://scaredtosacred.info/uploads/1/3/0/6/130621554/65434119.pdf
    • http://raleighlaxfest.org/uploads/1/3/0/5/130588951/jewekev.pdf
    • http://tandtphysio.com/uploads/1/3/0/4/130483125/banorek.pdf
    • http://marcussilvaonline.com/uploads/1/3/1/4/131437846/datukaluviwo.pdf
    • http://harvestchurchohio.com/uploads/1/3/0/8/130814669/lipuladadafubu.pdf
    • http://sunrisemanagement.net/uploads/1/3/0/7/130776208/xukobanuluzimu.pdf
    • http://dankepadre.com/uploads/1/3/1/6/131606128/5978163.pdf
    • http://precisionrunning.com/uploads/1/3/0/7/130739258/7255ce1d0c.pdf
    • http://kowaltzkedrillingservices.net/uploads/1/3/1/1/131164372/fajepeda.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_off00017e51.bin
38596931a9373d17a493126aa13f03d93f5fbf18e4801890c33e59b8260efeb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E51 9100 bytes

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