Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdac4c63ad2cb93…

MALICIOUS

PDF

35.7 KB Created: 2020-04-02 03:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8614b3ec72023db8e9fbf38b267f22e SHA-1: 883b41da883e88ade83337684fb1acfe7b9a5d44 SHA-256: ebdac4c63ad2cb930079e61a221ffd778ee7c814a4e7e707eba431077abc8cee
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded 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://katiaponomareva.com/uploads/1/3/1/4/131453688/131453688.html#thank+you+for+your+support+highly+appreciated
    • http://mrdoghk.com/uploads/1/3/0/8/130874038/sivixugixurew.pdf
    • http://nbcunivcareers.com/uploads/1/3/0/7/130775694/ruzolagigozafed.pdf
    • http://kmfcivil.com/uploads/1/3/0/8/130874232/bogolavanivi.pdf
    • http://thebombayvibe.com/uploads/1/3/1/3/131379923/fc0ddb66cb9a80.pdf
    • http://decolonizetheclass.com/uploads/1/3/1/4/131407179/lapatali-vazinopukogobe-fojosezirigi-tiselet.pdf
    • http://tinytotdressshop.com/uploads/1/3/0/4/130436089/1788263.pdf
    • http://asc-it.at/uploads/1/3/0/7/130739936/cb1c6d236.pdf
    • http://amandahessenutrition.com/uploads/1/3/1/4/131406222/piwesewowimepux_pomekovevogudof_pusexelumu_bijoxezifeve.pdf
    • http://welnasoutdoorservices.com/uploads/1/3/0/2/130272509/gafolafamugodere.pdf
    • http://northernskytradingcompany.com/uploads/1/3/0/6/130621698/359d4257599277.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_off000064b7.bin
39d47da43ce32a07c627b684c8296f77f986649829a2d1d66889875be86057f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 7396 bytes

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