Malicious PDF — malware analysis report

Static analysis result for SHA-256 426f194d482334c5…

MALICIOUS

PDF

67.6 KB Created: 2021-01-07 21:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8172ccfa411e98261bf0448bbe0d19ef SHA-1: d19438ca75fdb2630669aed39d44e8b94c311c75 SHA-256: 426f194d482334c5a9b1c0992ec04a1affc84469c87db577cb343e7eba1352f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link farm detection and a critical ClamAV detection. The document contains numerous external links, many pointing to Weebly and f-static.net domains, suggesting an attempt to redirect users to potentially malicious content. The presence of embedded URLs and the ML classifier's high score indicate a strong likelihood of malicious intent, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://trafffe.ru/aws?utm_term=brother+dcp-+l3551cdw
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/wopujemufonaxeboz.pdf
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5fa6c572e7b2a.pdf
    • https://cdn-cms.f-static.net/uploads/4408720/normal_5f98f88b564ea.pdf
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/917616.pdf
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/d5c80ce9b.pdf
    • https://cdn-cms.f-static.net/uploads/4456378/normal_5fbad1ada1ddb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jusagi/communications_tone_of_voice_guidelines.pdf
    • https://s3.amazonaws.com/nakevoja/tudanupurujibikiz.pdf
    • https://s3.amazonaws.com/litunux/arrest_warrant_search_louisiana.pdf
    • https://s3.amazonaws.com/sabobenuwe/76293586577.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb5f.bin
3b4567c43e7859ef0eb4f582fc5699f4dd257bf0a597188cf4c3003a9d289ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 5284 bytes
font_01_sfnt_off0000dd7c.bin
d5caaaea75e3f26fc7a6cf1b98ce357c76f288ed68694fa3be4241f401b539bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 10848 bytes

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