Malicious PDF — malware analysis report

Static analysis result for SHA-256 43570d680ab41efc…

MALICIOUS

PDF

69.8 KB Created: 2021-06-11 23:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2e379c90857ffd24387eced7e9b2444 SHA-1: e00c9710d1769d6f14da388ef007bcc1f07096f5 SHA-256: 43570d680ab41efcbae64f318caab41f47e21abef2f6a293f3259de303774ca8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and numerous URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://drafthe.ru/pbw?utm_term=kids+gk+quiz
    • https://wegizazuxiri.weebly.com/uploads/1/3/0/8/130814830/pufigezisujogep.pdf
    • https://cdn-cms.f-static.net/uploads/4365594/normal_606d9cad5ede0.pdf
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/begurew-xemuto-ruvilonexubog-kexawulidow.pdf
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/gekutekulibuwo.pdf
    • https://dopolijakom.weebly.com/uploads/1/3/4/5/134527788/rofipunasu_nimabi.pdf
    • https://cdn-cms.f-static.net/uploads/4500438/normal_603bea3bc6e2b.pdf
    • https://duvirimak.weebly.com/uploads/1/3/4/6/134603536/286241.pdf
    • https://guvepelave.weebly.com/uploads/1/3/4/9/134900482/mumatuze.pdf
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fe2329f20e89.pdf
    • https://cdn-cms.f-static.net/uploads/4383146/normal_605689a99201e.pdf
    • https://xuxamiwi.weebly.com/uploads/1/3/4/6/134624415/ee5a0d5d5dbfa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vamafob.pbworks.com/w/file/fetch/144662250/24572321603.pdf
    • http://mefijunov.pbworks.com/w/file/fetch/144420597/how_to_become_an_electrical_electronics_engineer.pdf
    • http://dadilotofexi.pbworks.com/f/tujivezabapekawabafepilu.pdf
    • http://jabodawo.pbworks.com/f/zelitajiduxa.pdf
    • http://podixarutib.pbworks.com/f/66896096885.pdf
    • http://bekiravetad.pbworks.com/w/file/fetch/144789225/bovuxuve.pdf
    • http://gatunam.pbworks.com/w/file/fetch/144528912/jewimuvozigixuf.pdf
    • http://bujolajoxek.pbworks.com/w/file/fetch/144530013/82754916672.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_off0000d569.bin
dc3df19a7c16dd14e8eed2b25ad5b7d1acfb45e4dbafecc8849e06520a4c2c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 4864 bytes
font_01_sfnt_off0000e60f.bin
fc3a48c367ccd716efcaf40b91d6ed618e11cddd265416eadf23707c234c90a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 10760 bytes

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