Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d88f950a4c7b02…

MALICIOUS

PDF

33.8 KB Created: 2020-06-09 05:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35db65ae2198b91a6b0135b63ffab1cc SHA-1: 84e1c8e22ba67ba9cbfb10daa0725fb2616c6682 SHA-256: 29d88f950a4c7b0244c98576afe87c5b9f43485ef22171922b3fcba679af0b01
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used in link farm attacks to distribute malicious content. The document body, though partially garbled, suggests a lure related to 'printable memorization exercises' which directs users to external URLs. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful sites.

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://zacteeco.com/uploads/1/3/0/6/130604413/130604413.html#exercices+de+m%25C3%25A9morisation+%25C3%25A0+imprimer
    • http://createdgamers.com/uploads/1/3/0/8/130813934/xuwiji.pdf
    • http://rppsolutions.co.uk/uploads/1/3/0/4/130488217/f43ff96c7df0.pdf
    • http://tbdservices.net/uploads/1/3/0/6/130620956/wuvid-femogokil.pdf
    • https://lezidonopo.files.wordpress.com/2020/06/29725775214.pdf
    • https://boxagoboloj.files.wordpress.com/2020/06/musazutenivimasapifimi.pdf
    • https://xewefevoba.files.wordpress.com/2020/06/97136243425.pdf
    • https://dakenoxuw.files.wordpress.com/2020/06/zuwobufolomiruvidixizumod.pdf
    • https://xuzetepevot.files.wordpress.com/2020/06/42403078875.pdf
    • https://fugajenufafe.files.wordpress.com/2020/06/67302061822.pdf
    • https://gezuduropen419134146.files.wordpress.com/2020/06/26269276205.pdf
    • https://lugolasef.files.wordpress.com/2020/06/16603204820.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_off0000564a.bin
3c00f24719227743c1572d1e8e5a5feff0f96c85eb2532c450f2d3145f7f9b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x564A 11332 bytes

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