Malicious PDF — malware analysis report

Static analysis result for SHA-256 0239ec40a8626123…

MALICIOUS

PDF

36.0 KB Created: 2020-06-20 02:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 495bba9327bfc73d767a08a168f26c25 SHA-1: 2173b2abac4ddd3f871239aca27f8e6fc364d464 SHA-256: 0239ec40a86261238b432512c58858c4e7a1fe0a794e3f63311b20faf0ff9368
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, a technique often used to redirect users to malicious websites for further exploitation. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://dephnesdesigns.com/uploads/1/3/0/6/130621000/130621000.html#lexmark+x4500+manual
    • http://rsofacts.com/uploads/1/3/0/8/130813885/4748135.pdf
    • http://lhsdebutantes.com/uploads/1/3/0/2/130270745/zubisavaba.pdf
    • http://microray.us/uploads/1/3/1/4/131406273/vejomagugu_foraja_sopazira.pdf
    • http://laughingbat.net/uploads/1/3/0/7/130739817/nulatoka_roruvanixukada_nukezufabapizu_sawidefekevan.pdf
    • http://coxllc.com/uploads/1/3/0/7/130739996/2369826.pdf
    • http://jayjacobsmusic.com/uploads/1/3/1/6/131636601/rurelut.pdf
    • http://lariane.eu/uploads/1/3/1/4/131438517/tuxisex-viduj-wakir.pdf
    • http://dedicated-22.pleasingfood.com/uploads/1/3/0/3/130323213/6f18575.pdf
    • http://macrotopia.com/uploads/1/3/1/3/131398182/5429502.pdf
    • http://k9clobber.com/uploads/1/3/1/8/131856998/dovojeniti-bovixok-pukomova-wowedegot.pdf
    • http://thehuntsjournal.com/uploads/1/3/0/6/130639140/logutokusobexovitoj.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f42.bin
528b20ad293788fc252c19bed62fe7838072185227e67868274e36b08b518ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F42 4724 bytes
font_01_sfnt_off00005f30.bin
5061cd5bc79fad0d227647ed5cd694f4615e77236d62a6e2edeef35b1f4148dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 10776 bytes

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