Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ff95bc866c4ebe…

MALICIOUS

PDF

30.9 KB Created: 2020-04-12 06:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f6abf3d7a2aaeb5c5e9bb4b98ebad81 SHA-1: 685210a4abb19cc24a49566c62ad1a2ca22caffd SHA-256: 91ff95bc866c4ebe849d6c1283e505584b10c97fd2f4cf4aedfca2632393b2f3
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body contains garbled text and what appears to be a reference to a book title, likely a lure. The primary attack pattern involves redirecting users to a network of potentially malicious websites.

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://jenntreado.com/uploads/1/3/0/6/130620537/130620537.html#libro+baldor+aritmetica+mercadolibre
    • http://partychard.com/uploads/1/3/0/6/130604085/walikesa.pdf
    • http://atdrama.com/uploads/1/3/0/5/130588246/modeki-lawanofo-lezobo.pdf
    • http://hmimmigration.com/uploads/1/3/1/1/131164315/8472528.pdf
    • http://1interiors.net/uploads/1/3/0/2/130287407/9160360.pdf
    • http://montemedia.co/uploads/1/3/0/8/130874340/vuxilowenaz.pdf
    • http://healthcarereformsurvivalguide.com/uploads/1/3/0/4/130483753/ccad8e0d13.pdf
    • http://leohairdye.com/uploads/1/3/0/2/130289782/9931951.pdf
    • http://mychangingthenarrative.com/uploads/1/3/0/5/130550830/140507.pdf
    • http://bmzsolution.com/uploads/1/3/0/6/130605073/guzorikaxizozukol.pdf
    • http://mychargerland.com/uploads/1/3/0/7/130776489/palamosevoxo-saxakogesogefi-puruwos.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_off000051e3.bin
66d8dbb84f16f5e59dc620b60bc9a13af05795783069113134f8912fcd55d222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E3 8060 bytes

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