Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9538dbf1d71d09e…

MALICIOUS

PDF

27.9 KB Created: 2020-04-08 12:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d891338716cf743a7daad28f3e95aada SHA-1: 3b9d53583cc0ae3312bfd89bbe25b00ff28a94bc SHA-256: f9538dbf1d71d09efa59301479f6f1a55ba2d57eafa4266fa135e4dc0ea52f2a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The presence of multiple URLs pointing to domains with numeric or generic slugs suggests an attempt to create a link farm or distribute malware through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wwwdaimondholiday.com/uploads/1/3/1/0/131070688/131070688.html#gopro+3+black+instruction+manual
    • http://lobodourado.com/uploads/1/3/0/5/130540788/2537100.pdf
    • http://cubanostreetfood.com/uploads/1/3/0/9/130968915/rexeriza.pdf
    • http://influentialsalespeople.com/uploads/1/3/0/5/130541904/sotidakoza-basopalove-nifaviwi.pdf
    • http://stjosephelkoym.com/uploads/1/3/0/5/130551181/6e9a0b87a4.pdf
    • http://yibaay.com/uploads/1/3/0/3/130313718/6cf4e.pdf
    • http://heatherweddings.com/uploads/1/3/0/6/130640109/a916fda9.pdf
    • http://eyeh.org/uploads/1/3/0/4/130476611/kafipewekud_nepibe_taponidasaw_rupolokazop.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_off00004818.bin
adad3df0eea4695294ebbd71c4b089bd1979d746eab02e0a50dee7e9c7f99d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4818 6296 bytes

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