Malicious PDF — malware analysis report

Static analysis result for SHA-256 6519efb09cfe4efc…

MALICIOUS

PDF

41.4 KB Created: 2020-05-28 14:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91f5296f0a9bf084c33832bd32f272ef SHA-1: bb43e57ea5600689865c26a0af4e0c722242794c SHA-256: 6519efb09cfe4efc7ce918b3370d730074aab17867e1aa349cac06c6df7ca328
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous external links, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, contains text referencing 'Espn case study' and 'wkhtmltopdf', suggesting a lure to a fake case study page. The presence of multiple PDF links points towards a strategy of redirecting users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dantoned.com/uploads/1/3/0/7/130775372/130775372.html#espn+case+study
    • http://cpcontacts.pee-rite.co.za/uploads/1/3/0/7/130775078/gadezokufemofisawika.pdf
    • http://forresthillmusic.com/uploads/1/3/0/3/130324004/4071144f26f7e47.pdf
    • http://byyourlight.com/uploads/1/3/0/6/130605059/5bf87c7b1dc49f1.pdf
    • http://southwestenterprisesllc2015.com/uploads/1/3/1/3/131383837/mofita.pdf
    • http://southerncharmpomskie.com/uploads/1/3/0/2/130273581/safivajo-disig-zixum-vugabelojavix.pdf
    • http://fetchenergy.com/uploads/1/3/1/4/131438217/nejor.pdf
    • http://fcbtlaw.com/uploads/1/3/0/5/130588620/62f55.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/
    • http://scripts.sil.org/OFL
    • 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_off00006213.bin
11c2a599b18d479523da4a0a6adba686ec33e8c9a0062c77091155f004b4989c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6213 10348 bytes
font_01_sfnt_off000085b4.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B4 16060 bytes

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