Malicious PDF — malware analysis report

Static analysis result for SHA-256 642c5eb6b296da55…

MALICIOUS

PDF

74.9 KB Created: 2021-02-25 23:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: df7edfd3fdb511e22e915424f33f7eb2 SHA-1: f0fecb3baf26e4a32336526bafbdfc180a699318 SHA-256: 642c5eb6b296da555029ce754c4329f8378648e2b7520fa1b288d0db90a091c0
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other hosting services, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains text related to 'circuit analysis 11th edition pdf' and the wkhtmltopdf application, indicating a lure to disguise the malicious intent. The presence of ClamAV and ML heuristic firings confirms its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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 https://bologen.ru/award?keyword=circuit+analysis+11th+edition+pdf PDF link annotation
    • https://rawubewo.weebly.com/uploads/1/3/1/4/131405976/bitelumarolalo.pdfIn PDF document text
    • http://legendarycraft.ru/is_taco_bell_safe_to_eat_after_recallrjll6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_6018723b3a8eb.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/fezugaguvow-rerupuxe-belifovalata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_601f86d3211b9.pdfIn PDF document text
    • https://guwifanifinib.weebly.com/uploads/1/3/2/7/132740319/taxojidipawul.pdfIn PDF document text
    • https://xaxaguxoludu.weebly.com/uploads/1/3/4/5/134519627/dedunejufuwof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_60219a38eb0ee.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/fufavekegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/duck_hunting_ontario_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/balkan_bet_lista.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/how_to_restart_arris_sb6141.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/the_advisors_alliance_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/jimokinepewojidilojo.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 5304 bytes
SHA-256: 84028389d16f5c285f741595b498d54ac05d2f6895747be73100bd41bb3a66c6
font_01_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 15088 bytes
SHA-256: 7e50d2a55020dcee40f26176470f08e9edab248e138f5f935c9c23bc63e5f2a1

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