Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a002d4706b2bce0…

MALICIOUS

PDF

53.7 KB Created: 2020-05-06 01:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb23deb13d7e7555b083b429f00856b2 SHA-1: 91af65d21cf3af8c1fcef42d276fa54a6956275c SHA-256: 2a002d4706b2bce06150ca7e0fe5671a2c1e362043020d35cca7d362422a6ed9
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to similarly structured URLs on different domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body contains a question about 'cisf' and references wkhtmltopdf, suggesting it's a generated document designed to host these links.

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://afaparents.org/uploads/1/3/0/4/130483773/130483773.html#what+is+a+full+form+of+cisf
    • http://elementsorganic.com/uploads/1/3/1/4/131453150/1618985.pdf
    • http://thespiritedwarrior.net/uploads/1/3/1/0/131070437/3772930.pdf
    • http://arizonainhomepeteuthanasia.com/uploads/1/3/1/4/131452841/7545367.pdf
    • http://sd-architectural.com/uploads/1/3/1/8/131857049/ccaa5b801d100.pdf
    • http://rachelstruth.com/uploads/1/3/0/6/130639347/rupelokemururum-merukonaxon.pdf
    • http://powerhouseoutreachministries.com/uploads/1/3/0/4/130476878/2722374.pdf
    • http://brautbecher-hochzeitsbecher-geschenke.de/uploads/1/3/0/7/130740001/bapikudoxafaweroj.pdf
    • http://sabiamath.com/uploads/1/3/0/3/130323329/nadogunub-dovorivuseg-xufog.pdf
    • http://authenticallymecoaching.com/uploads/1/3/0/7/130738550/nepumosox.pdf
    • http://radioscience.com/uploads/1/3/0/8/130874586/028f744dfec.pdf
    • http://servicersender.com/uploads/1/3/0/4/130488810/nepos.pdf
    • http://prolificdreams.net/uploads/1/3/0/6/130621480/piwufobilo-ponosawurerato-bojazav-fifutep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091ae.bin
f1b3bfee8b8f276a0b62ed2c006b34176b08c2b7e9c3a7a2c5a680ae92f87374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91AE 10952 bytes
font_01_sfnt_off0000b74d.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB74D 16164 bytes

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