Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a62a9e9ae919d3…

MALICIOUS

PDF

38.5 KB Created: 2020-04-07 04:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d95ceac627a2affdf2b83fa333212402 SHA-1: 39d1e89c08a57166c2fc1f899c1a815b06e011ec SHA-256: 73a62a9e9ae919d3e3963d8b475a5f21c15a0994cbd4b426d11000cc6928d61d
96 Risk Score

Malware Insights

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

The PDF document contains a lure related to office supplies, but its primary function is to act as a link farm, directing users to numerous other PDF documents hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm, suggesting a tactic to distribute further malicious content or engage in SEO abuse.

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://inventscape.org/uploads/1/3/0/8/130874533/130874533.html#modelo+de+oficio+para+solicitar+suministros+de+oficina
    • http://themoderndaycindi.com/uploads/1/3/0/2/130291485/787464.pdf
    • http://davidellis-photo.com/uploads/1/3/0/4/130477192/guwataveber.pdf
    • http://www.store.treeofoil.com/uploads/1/3/1/4/131437978/1713082.pdf
    • http://rugvedmavidipalli.com/uploads/1/3/0/2/130289676/jadigidobujemu.pdf
    • http://limitlesspilot.net/uploads/1/3/0/7/130775735/wasupuretobu.pdf
    • http://farahsskinbar.com/uploads/1/3/0/5/130546497/8276227.pdf
    • http://spoontaneous.com/uploads/1/3/0/4/130483794/5409373.pdf
    • http://wakeful-life.com/uploads/1/3/0/6/130639588/7838779.pdf
    • http://cjservices.fr/uploads/1/3/0/2/130270837/negamasaw.pdf
    • http://momentumdmedia.com/uploads/1/3/1/0/131070450/joluwigoxun.pdf
    • http://khaleesihairco.com/uploads/1/3/1/3/131384240/0e707c.pdf
    • http://rayaneid.com/uploads/1/3/0/7/130776027/pitejuvaxinetat-tanobowafigufun-soviw.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_off00006a7c.bin
d7ebe7f359b94ffa2f2de513112ce05930628b5a7937287ebe2ea1cb52732700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7C 8892 bytes

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