Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a63e413d0e6620…

MALICIOUS

PDF

73.7 KB Created: 2021-01-25 22:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a8ad8b57de74824dd0bf460cd4eb8fd5 SHA-1: b6b5c328d036ba674ccbd6010b4f30f68718bbd3 SHA-256: 13a63e413d0e66207d69e1773753eaa73e4d6e32170e1254c8e640b16026ed2a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URL `https://seumenha.ru/123?utm_term=super+king+buffet+near+me` is presented as a search result, indicating a lure. ClamAV detection and ML classification confirm maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=super+king+buffet+near+me PDF link annotation
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/6306726710ff3.pdfIn PDF document text
    • http://free-at.pro/motorcycle_wallpaper_iphone_11_proyu8fm.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/jbhiss0/cardboard_boxes_with_lids_uk.pdfIn PDF document text
    • http://ygrash.website/bekibal4mlhj.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/MhifD25/rock_pocket_mouse_activity.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/ahgZjhH/download_hovercraft_takedown_mod_apk_1._5._4.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/hGayghM/86549029046.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/jgbqhhi/zombicide_kickstarter_abomination_pack.pdfIn PDF document text
    • http://okrasote.info/gatwick_strike_july_2019asf37.pdfIn PDF document text
    • http://regse.website/lion_king_2019_runtime_without_credits50h40.pdfIn PDF document text
    • https://dezubawutojowi.weebly.com/uploads/1/3/1/3/131398539/wanapadipoturugiko.pdfIn PDF document text
    • http://mamajan.space/archer_season_11_episode_3_reviewvbe1u.pdfIn PDF document text
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/9441193.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/muvemasoxaji/captain_commando_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/solving_linear_systems_by_graphing_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/ielts_speaking_questions_with_answers_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 5320 bytes
SHA-256: 2b93e9b4273493e59de6f19907c2df34f6184a6081996edaf20955a318772936
font_01_sfnt_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 1936 bytes
SHA-256: cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
font_02_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 10952 bytes
SHA-256: 65393ec27d2119ecc57a6113f3c2ca83c0a6be51452407ac93217adc6abf44c8

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