Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c641ae8332fecf…

MALICIOUS

PDF

83.9 KB Created: 2021-03-15 21:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4df35f3936ac0e31ea0e553cf2c4755b SHA-1: 654be844baf83ec6fba309a5dd9286c8bc9a454d SHA-256: f5c641ae8332fecf7aeb1713548b8275b511716bd3d065c42ba89963f6845ba0
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('soxebez.ru') that is likely used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a 'cbs channel guide'. The presence of many disposable hosting links further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://soxebez.ru/123?utm_term=cbs+channel+guide PDF link annotation
    • http://buytoday.cc/pc_building_simulator_sizeypvj0.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/nulizoguzabo_jomazedug_kedabij_nopovivu.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/nourishing_traditions_pregnancy_diet.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/207fbc8c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5fc583af55cc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_600c88b155f30.pdfIn PDF document text
    • https://popibixa.weebly.com/uploads/1/3/4/7/134745137/mixezovafubowefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489583/normal_600dac22a8955.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/1647230.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/mcgraw_hill_algebra_1_answers.pdfIn PDF document text
    • http://blekrossi.ru/how_to_apply_cricut_stickerg0vc1.pdfIn PDF document text
    • https://sudiseva.weebly.com/uploads/1/3/4/4/134470115/1921972.pdfIn PDF document text
    • http://lessonsonline.site/what_does_ethics_mean_in_greekqo6fj.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/ba9c16dd-47b9-411e-8f6e-ea1e9596679b/is_sherlock_holmes_the_devils_daughter_multiplayer.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/24212788760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/497a2c5d-6a82-43d2-9c60-8636b470d373/devuwibovuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a37188-a2d2-411b-b4e0-9ef440002c75/67500921220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53e1c7d-9b2d-4a52-a3a1-de1ee585828d/62358424680.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/hide_navigation_bar_android_without_root.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49cfb0e-cba4-4584-9978-7dfa98a4f8a8/playstation_vita_emulator_games.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/madozafuxadilewu.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/budgeting_loan_form_universal_credit.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/color_app_para_android.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_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 5148 bytes
SHA-256: a78140e63ba7f769fff8f5fd78eb8a14302c450ac580abf79ddb496cda7f2c61
font_01_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 10688 bytes
SHA-256: 15e7c046051b67c348239b0a624e1ea4493b51a8edb539ea19c669c2e6729b07