Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2f9904b0220437…

MALICIOUS

PDF

70.9 KB Created: 2021-06-10 18:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98b8e591efa306cf841dc1a255cbb082 SHA-1: f943f1134931cbf1cacb97be57b67f2d394bc2ba SHA-256: 6c2f9904b022043732d7a1325a05ae53d656496c3f585fd4c7693ad9fd54f092
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary URL being a phishing lure for 'game guardian apk pubg mobile'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/pbw?utm_term=game+guardian+apk+pubg+mobile
    • https://dawukobisoxewi.weebly.com/uploads/1/3/4/0/134040495/bawivikanede.pdf
    • https://pomitowu.weebly.com/uploads/1/3/4/3/134389192/sililikubag.pdf
    • https://vagajexaxe.weebly.com/uploads/1/3/4/3/134359414/kugubopeti.pdf
    • https://fuwivofopotafuj.weebly.com/uploads/1/3/5/3/135388640/tikisozuzolovix.pdf
    • https://bafupenog.weebly.com/uploads/1/3/4/1/134131575/lakilavi.pdf
    • https://renugukid.weebly.com/uploads/1/3/0/9/130969315/kadororevu-pajulipaburavuk-nowug-gonik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gogogivu.pbworks.com/w/file/fetch/144977997/streaming_film_transformers_3.pdf
    • http://natetusiwuwo.pbworks.com/w/file/fetch/144806808/what_is_a_theme_for_courage.pdf
    • https://uploads.strikinglycdn.com/files/a8f2f5fc-2047-487e-b79c-43d22d42a097/bissell_proheat_2x_revolution_upright_carpet_cleaner_-_red_review.pdf
    • https://uploads.strikinglycdn.com/files/43bebf92-dd2e-44dd-848b-2b4c2df95423/world_history_ancient_civilizations_through_the_renaissance_workbook_answers.pdf
    • http://tovemubu.pbworks.com/f/zumomimotibopi.pdf
    • https://uploads.strikinglycdn.com/files/845ec5fd-12ec-48c2-a435-a4992d0fd741/79366022891.pdf
    • http://figinav.pbworks.com/f/todip.pdf
    • http://dekokos.pbworks.com/f/94232552037.pdf
    • https://uploads.strikinglycdn.com/files/79b6b1c1-3c61-4dda-bba8-e060892e6570/learnsmart_answers_physics_fundamentals.pdf
    • https://uploads.strikinglycdn.com/files/575b1617-6497-4b69-a353-7ded139db52a/12367811046.pdf
    • http://pezeliv.pbworks.com/f/8208317742.pdf
    • http://xesimisejek.pbworks.com/w/file/fetch/144583662/6266035187.pdf
    • https://uploads.strikinglycdn.com/files/50592596-8f89-4006-b728-b56547167f93/zebutaguzukufir.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_off0000d683.bin
0bfe6dbef06784eeb5f557a00bc6b1a18b1a6d03d96e7b186d7ef4205eced1bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 5336 bytes
font_01_sfnt_off0000e893.bin
df6fb58712fad47a95453487fcf5bc9c9cfc609e224dd7e56c46e448e3d7103b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 11560 bytes

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