Malicious PDF — malware analysis report

Static analysis result for SHA-256 76366c0df8132b40…

MALICIOUS

PDF

44.3 KB Created: 2020-04-02 13:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5433025a5a6ddbac7a7563b35e0ecabf SHA-1: 2c2d07413511619dd21b931805e496e2d51310ff SHA-256: 76366c0df8132b40b7b41a3d31225cb4fa0566e3fe38914365f967be93ce213c
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files across various domains. This behavior is indicative of a link farm or SEO poisoning attack, designed to artificially inflate search engine rankings or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://greaterlafayetteindiana.com/uploads/1/3/0/8/130814205/130814205.html#ceramica+los+mayas
    • http://onceuponatimemain.com/uploads/1/3/0/8/130813601/vivufalaki.pdf
    • http://nanakexpeditors.com/uploads/1/3/0/3/130323400/bc58ede243010c.pdf
    • http://on3pose.com/uploads/1/3/0/4/130476984/6398657.pdf
    • http://friendsofmit.org/uploads/1/3/0/8/130814055/3027370.pdf
    • http://minijarts.com/uploads/1/3/0/7/130739889/rasogi.pdf
    • http://harpsvisuals.com/uploads/1/3/0/3/130323106/nitef_disedibovug_puruxup_xomibi.pdf
    • http://aquasquirrel.com/uploads/1/3/0/5/130551247/7a7c83.pdf
    • http://healmyleakygut.com/uploads/1/3/0/5/130590393/9636637.pdf
    • http://abrasax.info/uploads/1/3/1/1/131164249/34432f2e5fe9.pdf
    • http://lintonconstruction.com/uploads/1/3/1/0/131071145/zabibatiwesofutiwego.pdf
    • http://onechoiceonelife.net/uploads/1/3/0/9/130969813/zixuzisukotagik.pdf
    • http://blazaklaw.net/uploads/1/3/0/7/130738546/2949980.pdf
    • http://banzaiwraps.com/uploads/1/3/1/4/131437461/rerovifokojuwar.pdf
    • http://themalibubuilder.com/uploads/1/3/0/6/130639599/7347809.pdf
    • http://xoglamaccess.com/uploads/1/3/0/4/130475981/6128358.pdf
    • http://upgradedcomputers.com/uploads/1/3/0/5/130590682/136ddfe3e3f.pdf
    • http://indiansummerfestival.org/uploads/1/3/1/0/131070306/zereb_zekidofafexopo_sojif.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_off0000841e.bin
facb14f02af273a41251986fe49506df99d2b3889f855ae0f4f517417b2d658c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841E 8412 bytes

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