Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c22f809df0a839…

MALICIOUS

PDF

81.9 KB Created: 2021-06-08 20:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4ed0f5ac8bae0f373cb39a692796aef0 SHA-1: 3e9475f93917f13f0bd302cbd84e43aeb35784d8 SHA-256: 50c22f809df0a83930fc3c67c1eb71a75bb712bff195725558a31dc887bceffe
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0) and an ML classifier with a high confidence score. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to game cheats, directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/pbw?utm_term=gta+san+andreas+cheats+codes+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408983/normal_606bdd71ac4bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484995/normal_5ff6a84c921f5.pdfIn PDF document text
    • https://wilufonikeku.weebly.com/uploads/1/3/4/8/134878677/7177865.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/ffedc831c10c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fd677123fb39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_6030d9c4c591b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeveriwilum.pbworks.com/w/file/fetch/144838500/49460922386.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/femivurukibogidowenepozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791e7db9-7e72-4787-a56a-d6dcf9cf0f34/rosencrantz_and_guildenstern_are_dead_death_monologue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82bacd8b-e43c-4419-922f-b44df54df419/89454074634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80eda0eb-e61b-4dbc-b9dd-609149af99f5/28775179971.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144521247/ritasarafurubofizokup.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/w/file/fetch/144543102/nepoborudo.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/w/file/fetch/144842820/69391099058.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/vocabulary_workshop_level_a_unit_11_antonyms.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/le_prsent_des_verbes_en_er_ce2_exercices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fdef74d-2be7-4ee9-8020-23a1df2f52d7/how_to_study_sacred_geometry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42c7364-4476-44a9-850e-c4e5e7ae4fd3/37_weeks_pregnant_swollen_face_and_hands.pdfIn PDF document text
    • http://mizelabe.pbworks.com/w/file/fetch/144535716/shortcut_to_shred_nutrition_plan.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/zuxif.pdfIn PDF document text
    • http://burixiligod.pbworks.com/f/19345824889.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/formalistic_approach_in_literary_criticism_ppt.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_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 5028 bytes
SHA-256: 542f3953374fb7b542b92ec3a4abeb045e5793a0932799aced997f234c11c6fd
font_01_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 11520 bytes
SHA-256: c667892b2a142a8a4c744bba17cafd0d8ba0452e4279896d32dec953becdbfd2