Malicious PDF — malware analysis report

Static analysis result for SHA-256 01448f5b5221803e…

MALICIOUS

PDF

76.3 KB Created: 2021-05-05 20:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da65c90a0d35bfb82ffb193d7d33cc10 SHA-1: 20443abf9161cc6046a785d03793a23fda84f774 SHA-256: 01448f5b5221803e334a77d21f548366187aa8e8642949ac90af1c14d7939c71
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links, many of which point to disposable or suspicious domains. The primary malicious URL identified is https://mezovuduw.ru/strik. The presence of a PDF_SEO_LINK_FARM heuristic firing and ClamAV detection strongly indicates malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and embedded URLs are sufficient evidence of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=cause+because+i+wanna+be+your+favorite PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454167/normal_5fe8bb7fd989c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_60404ed22516d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_604aca26608a2.pdfIn PDF document text
    • http://shoop-fn.ru/63567516229vs23w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_6066c730e9918.pdfIn PDF document text
    • https://wixolovab.weebly.com/uploads/1/3/0/7/130776385/08296cedc.pdfIn PDF document text
    • https://kibipevanisimak.weebly.com/uploads/1/3/4/7/134770361/pifudovuxuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_5fd7981a95434.pdfIn PDF document text
    • http://good-production9.site/pokemon_silver_walkthrough_kantok23ti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_600521d7d6999.pdfIn PDF document text
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/xuzopuzaza_xokus.pdfIn PDF document text
    • https://xonufukagupunim.weebly.com/uploads/1/3/1/3/131384400/gajuvasoxutuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483624/normal_6053653b76c9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_979b097a0252475ba1c6042ca07a5b39.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_8aa3f93b2d8f4e0095e47fa700629c78.pdf?index=trueIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_4e75aa64705047a892dc6c29acdc0ea3.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_aaa38e6d663a4e97959c0dc6d17e81ec.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_a033b87ae75b4823a25b58d4b38e6bce.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_67ea4708a49347dfaf5a886bd9345a01.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_d919ac27265a442bbdc0665b93ec6818.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_fa0639b028c44fed8564bf2e24416c3c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 5144 bytes
SHA-256: fd5aead7d3ea217f609a52bfa196376c4143b675d3a6dc5bc7bb101373d4ef86
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 11004 bytes
SHA-256: caaca7b661dd49de670408c7e860ec83c7bc25f6304ee99d9efc2730373a7cb4