Malicious PDF — malware analysis report

Static analysis result for SHA-256 996cb8d89b45e27f…

MALICIOUS

PDF

100.0 KB Created: 2021-03-23 19:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 630a4f70fdafeafcd9ba08b639cb8ec7 SHA-1: b4252970d2769f881b96b7640b25ddfc6efaecb1 SHA-256: 996cb8d89b45e27f5e9a67ea801141e8cd47b220bdd152a670505090fa465c19
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, https://mezovuduw.ru/strik, is likely part of this scheme. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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=definition+of+social+contract+theory+in+government PDF link annotation
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/kivolunato.pdfIn PDF document text
    • https://dukuvurijo.weebly.com/uploads/1/3/4/5/134522813/golenowakoniju-foxubolijomati.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/heX7mjb/impossible_game_answers_19.pdfIn PDF document text
    • https://zedusolurifi.weebly.com/uploads/1/3/3/9/133999882/suwobe_rogud_vebodijivel_pabenag.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/dAYkkgf/1943316269.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/jj4vheb/super_bubble_shooter_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fccd503-0646-4081-885e-64b90139ed2d/how_to_update_garmin_nuvi_1300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256196ac-30b0-4048-812b-ca500b4ef144/46467798583.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_18a3929ed7444020b5a67c48bed93f40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/der_eisendrache_fire_bow_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e53816d-2d8d-420b-9528-36fa4b6fad82/star_wars_edge_of_the_empire_character_sheet_fillable.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/5597828678.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_738d7fc305514aa492b017d20d24c326.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b78dea-db38-4978-ad77-78f445762d15/falasul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c044383f-3d40-4dfa-b750-3cc78266f555/44044629302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a69154-ed67-4540-9d25-c8fa9c65c280/99400583731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a08efe-029f-49ac-b81a-e5b6318b1d9b/how_to_fix_muffled_mic_ps4.pdfIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_f0cad99aa111439d83e54200244cf6e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c26ea3d-170c-41d8-b90a-f5c5d4f2c393/7598560123.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_off00014901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14901 5456 bytes
SHA-256: b9fa8cd833ce59cd08b542be6e2659df0a6cde96beabb92a78b247ca48a6dcf7
font_01_sfnt_off00015b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B89 11860 bytes
SHA-256: ff2ccafad619ed9e524d97c1a9fba6d6481fbfdde7b8ab51d507d5c34417b947