Malicious PDF — malware analysis report

Static analysis result for SHA-256 7912cc35e5ff33ac…

MALICIOUS

PDF

33.0 KB Created: 2020-05-13 13:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed938b79fdced3bc6bdb49b2c0700051 SHA-1: 6502baee90647d061202a8b5ed7f102e96d04fdd SHA-256: 7912cc35e5ff33acd542f8188578b6d3ccb74f72166cbab92007b3723ff1d290
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a method to distribute malicious content indirectly. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://crosspar.net/uploads/1/3/0/2/130272283/130272283.html#alesis+v25+manual
    • http://myoneclay.net/uploads/1/3/0/6/130621307/49e7d.pdf
    • http://mahachimeadowsllc.com/uploads/1/3/1/1/131164210/bevamafasopa.pdf
    • http://dwtaylor.com/uploads/1/3/0/2/130272365/rirefamonimoz-gawinek.pdf
    • http://destinedmarketing.com/uploads/1/3/0/9/130969225/1665481.pdf
    • http://injuryattorneyfortworth.com/uploads/1/3/0/3/130313263/valuwefetazudakijet.pdf
    • http://slightlyunhingedfashions.com/uploads/1/3/1/3/131397946/runibijadasa.pdf
    • http://armycorpenterprises.com/uploads/1/3/0/5/130541140/sokogarave.pdf
    • http://harrisonburgsepticservice.com/uploads/1/3/0/7/130775768/2e698e.pdf
    • http://owentart.com/uploads/1/3/0/5/130539654/9f1e916df2dcb.pdf
    • http://hughcarswelladamson.com/uploads/1/3/0/3/130323755/rabelugaje_giribitotelib.pdf
    • http://oktoberfestatdelmar.com/uploads/1/3/0/5/130590537/sujunazix.pdf
    • http://beesknees.fun/uploads/1/3/1/4/131483034/vegitogat_tolewim_tunigonasapot_jidozalapi.pdf
    • http://tbcexperience.com/uploads/1/3/0/6/130639098/4904652.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005688.bin
ffcfb066e95737f47abe1c9df0adc5248435f1d222339380b4f9b13ccf553402		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5688 10160 bytes

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