Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b667eb9191074ee…

MALICIOUS

PDF

70.2 KB Created: 2020-04-12 00:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 041549db5d3fd3e602dd804bc8c48f9a SHA-1: c6213e1b73de0d6925468e43fd81322106593749 SHA-256: 0b667eb9191074ee6e6b09d4618c6ad384bc75c8959d11069bb61bc41e360ee6
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports malicious intent. While no scripts were directly extracted, the structure suggests it may be used to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://bulldogcleaningandrestoration.com/uploads/1/3/0/5/130539203/130539203.html#cultura+azteca+aportes
    • http://international-swagger.com/uploads/1/3/0/4/130476370/besolimewen-bisizotedugave-fezepugog.pdf
    • http://focosoft.org/uploads/1/3/1/3/131380171/beliwubexusiduz.pdf
    • http://theallmychildren.com/uploads/1/3/0/2/130287553/zatusejoxe_bageboda_vezufewudelasu_wivupu.pdf
    • http://championcivil.com/uploads/1/3/1/4/131438003/lelaju_tuzuzapazo.pdf
    • http://thefurnitureguy.net/uploads/1/3/1/3/131383698/juniredano.pdf
    • http://watersidewine.net/uploads/1/3/1/4/131438086/1372773.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_off0000e93c.bin
f69fe04d4bc9f20631663e9ad622b7e0328992250577f1beda99f185b5a30526		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 9568 bytes

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