Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa19b8279842e7e…

MALICIOUS

PDF

32.7 KB Created: 2020-06-01 23:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e0d8159cf42648129baa4a03dac4bf4 SHA-1: 45484951dbc73bd3b84aea02eef576df160030bb SHA-256: 0aa19b8279842e7e59ec6208f01c73b626166a7769b6e0bf009aefb352c37892
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on suspicious domains, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to redirect users to potentially malicious content or for SEO manipulation. The document body contains garbled text and URLs, further supporting the malicious intent.

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://qatravelsupplies.com/uploads/1/3/1/8/131858791/131858791.html#eskimo+quickfish+6+recenzi%25C3%25AD
    • http://macsettlementservices.com/uploads/1/3/0/4/130488565/94c288d.pdf
    • http://mshdesignstudio.com/uploads/1/3/0/2/130272388/8999344.pdf
    • http://honeybeejuiceryoc.com/uploads/1/3/0/2/130288864/2885444.pdf
    • http://qatravelsupplies.com/uploads/1/3/1/8/131858791/terms.html
    • http://qatravelsupplies.com/uploads/1/3/1/8/131858791/dmca.html
    • http://qatravelsupplies.com/uploads/1/3/1/8/131858791/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xarefuwun.files.wordpress.com/2020/05/vupige.pdf
    • https://bezesevenej.files.wordpress.com/2020/05/60021931000.pdf
    • https://duzawexosusa.files.wordpress.com/2020/05/xuwubunatefutowesovobav.pdf
    • https://safowus.files.wordpress.com/2020/05/75324824530.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051ce.bin
8e28d9b404c2908c6f93f80f8dd47eb1e619037da5f6c607abb60dfbd33399d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51CE 10628 bytes

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