Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6c337d6c7dc40d…

MALICIOUS

PDF

75.7 KB Created: 2021-05-05 14:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cc9f040486c4bfef2df1a669c96a54ec SHA-1: c39cdc4104914f04ab19a986c8d98aaf06920652 SHA-256: 8b6c337d6c7dc40d1097b9b12e453149120c6bef9bf0ccc9019bee4f2caa8c1f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru/strik'. Heuristics indicate this PDF is a link farm designed to redirect users, and ClamAV detection confirms it as a phishing/trojan. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the link farm nature suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+draw+a+nose+step+by+step PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369495/normal_604660ac42030.pdfIn PDF document text
    • http://ctuxuu.com/fusovetegok1pse6.pdfIn PDF document text
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/nokafewitopo.pdfIn PDF document text
    • http://fukikenikiru.22web.org/nokisep.pdfIn PDF document text
    • http://3bki.ru/pegaxixarefewejusasavo375e7.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/2605460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_6027045ba320a.pdfIn PDF document text
    • http://rarobaxunugepa.22web.org/los_adjetivos_en_espanol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_6024ad0ad2386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_606cab95cfc7f.pdfIn PDF document text
    • http://zespodsvetkoy.site/91211833946o2i9.pdfIn PDF document text
    • http://dilurijarejo.22web.org/apgar_score_sheet.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/tajimipojimo/jogebigebobegopetonu.pdfIn PDF document text
    • http://wokikeka.epizy.com/9511775102.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/tarot_deck_cards_uk.pdfIn PDF document text
    • http://jawafezirosozo.epizy.com/breath_of_the_wild_guide_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/best_tactical_knife_fixed_blade.pdfIn PDF document text
    • http://gorevifero.epizy.com/punidoz.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/bolijifu.pdfIn 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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 5216 bytes
SHA-256: 9e0835b239e864faf4c6cd63efaf1a3d7b1c3e6ecff12565e23716cf4aebdb04
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 10848 bytes
SHA-256: 002c4ab91403be53c2a8aa789e375936e98c0c437e5155eaf9354e184f30a313

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