Malicious PDF — malware analysis report

Static analysis result for SHA-256 d491f36e82ff5d6d…

MALICIOUS

PDF

93.8 KB Created: 2021-03-15 05:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 1eeb09a249b34362a2351fe424a2b05a SHA-1: c1a600fba57b43c501e1c21217e583299f133022 SHA-256: d491f36e82ff5d6dc2e1ca20484e3562e49c2aaa05badb340ece5e5e20e609eb
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary suspicious URL pointing to 'bologen.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://bologen.ru/wix?keyword=star+wars+kotor+guide PDF link annotation
    • https://cdn.sqhk.co/nujoxodove/jeijDhc/fast_save_for_instagram_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_604aa360c2f91.pdfIn PDF document text
    • http://getcabinets.xyz/someone_like_you_chords_piano_sheet_music_free78z40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_601bc75c0a1d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_603bdf366a7fc.pdfIn PDF document text
    • http://123dutch.com/les_mis_pbs_cast_25th_anniversaryyl1hr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446646/normal_600bd41d6886b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd0ff461ef3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5fe3af531bcba.pdfIn PDF document text
    • http://vinograd.io/713522981990owh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470542/normal_6037542415963.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/WhaicAM/mining_accident_south_wales_the_crown.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/igcPhh5/brightest_flashlight_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/ijlJhhB/57430551869.pdfIn PDF document text
    • http://meblik.su/assign_multiple_roles_in_wordpressoytf7.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/icuHxsr/dakigudi.pdfIn PDF document text
    • http://boxberry-24.cc/howard_miller_wall_clock_westminster_chimeubdu9.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/1ed50e74-cf69-4bc8-821c-c67976a64985/pudawuzekugazunebikow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c869d311-fcad-43f8-a411-60822ee0b6e5/what_qualifications_do_you_need_to_be_a_cashier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d981ccb6-6af2-48fc-a646-0ae8d2f06d61/medical_terminology_prefixes_suffixes_and_root_words_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afac54a6-6b62-4632-96a7-303734c71f06/sevapogupidun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cc8443-4d54-4052-a109-6f5b097e7cc1/whirlpool_refrigerator_models_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141dd88a-6141-48f5-adca-69a016115066/biblia_en_hebreo_traducida_al_espaol_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74310ee-c3dc-4109-ae93-354708cc9bac/how_to_check_my_p_ebt_balance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82a7939-bf5b-463c-aa52-382828f33130/sct_livewire_ts_mount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa152af-f63d-4649-94ac-ed9eaa1bd55a/boropiwogajas.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_off00012ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA8 5220 bytes
SHA-256: a6ad3dd45bb30e5adc13c5ed2dcd15be9f07d983ee0e2c0dad5230988f8f1af3
font_01_sfnt_off0001408a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408A 12308 bytes
SHA-256: 39bcb4e174ecea9ef97f69fb0f1b30fcaf38574b7715c09c4df6d47795097bbf