Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7e061e99f85cfe…

MALICIOUS

PDF

41.7 KB Created: 2020-04-07 02:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 28f602726eb97835ab9aed3932f35028 SHA-1: f7967615220a7fe3df894599e08a355356a4f671 SHA-256: 0d7e061e99f85cfeb1ee57e0dcefebe5c512982fe15bce1084f09235139963e7
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of these links. The document body, though partially corrupted, contains a URL that is also present in the list of suspicious external links, suggesting a coordinated effort to redirect users. No scripts were extracted, but the sheer volume of external links points to a likely SEO spam or content hosting abuse scenario.

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://sensitiveminds.org/uploads/1/3/0/2/130289406/130289406.html#como+simplificar+polinomios+con+fracciones
    • http://emergencylid.com/uploads/1/3/0/3/130312974/rewojufenejejo.pdf
    • http://lusciouslucyplumpmmmjuicy.vip/uploads/1/3/0/6/130621292/3e1915242.pdf
    • http://beebrave.pink/uploads/1/3/0/9/130969051/bowisawaregibe.pdf
    • http://nemo4sale.com/uploads/1/3/0/6/130604433/ponolobolip.pdf
    • http://lumibodyart.com/uploads/1/3/0/7/130776096/suvezogaboxekomobel.pdf
    • http://texascountrysoaps.com/uploads/1/3/0/6/130639792/ponimupudas.pdf
    • http://www.rockinwithronandjon.com/uploads/1/3/1/4/131408086/dabuvugi.pdf
    • http://thymeandtansy.com/uploads/1/3/0/5/130550660/vekuxi.pdf
    • http://themoonladder.com/uploads/1/3/1/3/131398140/1980198.pdf
    • http://gypsydenisse.com/uploads/1/3/0/2/130289392/gibelokerutimigabo.pdf
    • http://allstarscomedyentertainment.com/uploads/1/3/0/8/130814559/464433.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000608d.bin
242c95780b30fa8499ffd70529f5b07c35c22debc3b6e730f3683873bc2d42d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608D 9396 bytes
font_01_sfnt_off000082e0.bin
3e9a9dfb40a01f9f7c9c545b28ba37f1de74591f2b47bc69a9983f40f3f3ebd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E0 16080 bytes

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