Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc6bb74885d83e8…

MALICIOUS

PDF

92.7 KB Created: 2021-05-23 14:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 944179899125819c07cf68232622db08 SHA-1: e2376a3fc2b577770ac67e0aaa39c61b56738d51 SHA-256: 5fc6bb74885d83e8655295aa38295f1bc9dc0d8acba13bcaba6c391450887452
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, with the primary malicious URL being https://kuzutuzo.ru/strik. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=mp4+hd+movies.org+2019
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/wobomezuxavasobadu.pdf
    • https://cdn-cms.f-static.net/uploads/4422884/normal_6030cffcdcef8.pdf
    • https://domirirezup.weebly.com/uploads/1/3/5/3/135382932/7a22d29cb5.pdf
    • https://cdn-cms.f-static.net/uploads/4379384/normal_60656932360dc.pdf
    • https://static.s123-cdn-static.com/uploads/4450248/normal_6003989838ab2.pdf
    • https://static.s123-cdn-static.com/uploads/4471719/normal_5ffc688da0264.pdf
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/zujexita-gomowusovol-nojufikelirag-tipibitore.pdf
    • https://static.s123-cdn-static.com/uploads/4393904/normal_5fc86c17cc54a.pdf
    • https://cdn-cms.f-static.net/uploads/4409806/normal_605316544bfc3.pdf
    • https://karelevoziwoda.weebly.com/uploads/1/3/4/7/134718414/kipezawanedij-zifetagi-mukevobufiruzor.pdf
    • https://cdn-cms.f-static.net/uploads/4382420/normal_6032dc5eb779d.pdf
    • https://static.s123-cdn-static.com/uploads/4384644/normal_5fecc04216819.pdf
    • https://cdn-cms.f-static.net/uploads/4420917/normal_6010ffa5592a4.pdf
    • https://ridewavovelomu.weebly.com/uploads/1/3/4/6/134697160/bekafoxox.pdf
    • https://static.s123-cdn-static.com/uploads/4487206/normal_5ffc31e2ec72b.pdf
    • https://cdn-cms.f-static.net/uploads/4388611/normal_602d91b26a3dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lomogas/zadobe.pdf
    • https://s3.amazonaws.com/bajuse/puzijumotiwesu.pdf
    • https://s3.amazonaws.com/nelizenejakarug/adapting_to_the_environment_worksheets.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/31659043046.pdf
    • https://s3.amazonaws.com/lulelepese/aguda_llana_esdrujula_y_sobresdrjula.pdf
    • https://s3.amazonaws.com/zidenigad/how_to_read_a_vacuum_boost_gauge.pdf
    • https://s3.amazonaws.com/xuzed/aptis_exam_practice.pdf
    • https://s3.amazonaws.com/megelugik/18567028521.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_off00012951.bin
482657bc74e7a54155ef0f6746637613c09118208cb23a2367282d8e4886c012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12951 5800 bytes
font_01_sfnt_off00013d09.bin
e6d2241d8de68a0943119b3b686e61375959f5a1950d4afec51e666051ba3556		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D09 11556 bytes

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