Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8c3aa795fe8d15…

MALICIOUS

PDF

81.1 KB Created: 2021-03-23 22:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6dd3db3ad856deb2cb64c0c26c6e55c SHA-1: c8efd0f46b8342e2e5815d6d68a36f4fdd640858 SHA-256: 4e8c3aa795fe8d156c82c7a9be92faff027fed663822e853c9c958b67bcfc9f2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to manuals, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://kuzutuzo.ru/wix?keyword=canon+xh+a1+manual+espa%25C3%25B1ol
    • https://cdn.sqhk.co/rufebumu/fieg2O9/zuxalitafisip.pdf
    • https://cdn.sqhk.co/fobonelaga/dZgcBgi/the_last_house_on_the_left_2009_netflix.pdf
    • https://cdn-cms.f-static.net/uploads/4426941/normal_604016170f875.pdf
    • http://jonotijero.medianewsonline.com/bebixosafolugot.pdf
    • http://fit-italy.space/50722764077vcxl9.pdf
    • http://stavki-na-sport.site/tesemosapipefepll9ls.pdf
    • http://usacarins.com/accidents_reported_today_in_majh598.pdf
    • http://xviiivbgz.com/candy_tumble_dryer_user_manual16t5l.pdf
    • http://mixit.info/78620061381459ty.pdf
    • http://m-laskin.ru/vevevunegeresareporovavipfkns.pdf
    • https://cdn-cms.f-static.net/uploads/4368978/normal_60587b34a0a6a.pdf
    • http://junumidutuzakox.getenjoyment.net/which_engineering_course_has_more_job_opportunities.pdf
    • http://sale20.site/63026055417tocxs.pdf
    • http://sellforce.ru/gym_shower_without_flip_flopssuyr1.pdf
    • http://bupetud.xyz/can_i_follow_gm_diet_for_two_weekswhgmv.pdf
    • https://cdn.sqhk.co/mifigatira/Vzhaprs/jovobeladubokozax.pdf
    • http://zisapawiwako.mypressonline.com/domain_driven_design_eric_evans.pdf
    • http://helpverifybadges.com/gmail_contacts_iphone_syncb5uxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f163525a-f41d-46fa-b905-533fec0be973/quadratic_equation_word_problems_with_solution_and_answer.pdf
    • https://uploads.strikinglycdn.com/files/aff52297-df89-4dc4-8791-20529e6e3371/babuxopurasedes.pdf
    • https://uploads.strikinglycdn.com/files/cfba6f11-1ccc-486e-a8e4-bb8bea28d33d/66816237647.pdf
    • https://uploads.strikinglycdn.com/files/6786c6d4-fac9-44f9-b914-c9db9e5ae884/kaviriketimozawaku.pdf
    • http://nejesezape.myartsonline.com/tobija.pdf
    • https://uploads.strikinglycdn.com/files/9d9e5038-5bf3-491a-a19d-fe5550534679/80963168164.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_off0000fd8e.bin
be1530c14aef7c3d398f0bdb906b69b29c770bdd7afdf526ca7ce6b6722f1180		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 5200 bytes
font_01_sfnt_off00010edd.bin
20ae3d3d9eaee6e75de3aaf50b432fb0976ec9b37027c93e74e18085dc319545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 11888 bytes

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