Malicious PDF — malware analysis report

Static analysis result for SHA-256 6236eae7837559b9…

MALICIOUS

PDF

53.4 KB Created: 2020-04-11 20:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b3051f2473b24df7fa98dbcf63fd39b9 SHA-1: 06465f1829b8334de5b1a0b3a18f09b8f87988b1 SHA-256: 6236eae7837559b99845dad0a91506580c36d880c82f2b0edc3f468ea64e2a49
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many with numeric slugs, indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious or deceptive content, possibly as a phishing lure or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://nagibahmed.com/uploads/1/3/0/6/130604522/130604522.html#polarizacion+de+un+transistor+2n2222
    • http://printfinishingshop.com/uploads/1/3/0/6/130604226/687c5.pdf
    • http://ringness.net/uploads/1/3/0/5/130588240/1299122.pdf
    • http://holisticvethousecalls.com/uploads/1/3/0/5/130539204/leweruw_divoniju_gulija.pdf
    • http://nyanyaekaterinburg.ru/uploads/1/3/1/4/131437603/burevesisemubirix.pdf
    • http://elliestewartmusic.com/uploads/1/3/0/3/130313613/7854196.pdf
    • http://4idealsconsulting.com/uploads/1/3/0/3/130379204/ximibigaguwoli.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084d0.bin
45d8bdc2bfb3cc280dc7c50334cf0c12eac326b7a701abce8ef26c55740253ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D0 9944 bytes
font_01_sfnt_off0000a884.bin
590512f41b45a2ca0bf891834303d06fab212e2bfb51db424341c5f720b3f120		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA884 3124 bytes
font_02_sfnt_off0000b37c.bin
f304d5248de4d2d535e11e5a3f00133999c598ccb7ee943f2677ab784214679d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB37C 16208 bytes

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