Malicious PDF — malware analysis report

Static analysis result for SHA-256 c405192c865bf8bc…

MALICIOUS

PDF

101.0 KB Created: 2021-03-16 17:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 20fc28c630ba15db521b7693a145bcb9 SHA-1: 0de7a7eb87369a79e92ac988da043423c9cb0aaa SHA-256: c405192c865bf8bcb8ab8c79bf31a38bf600e39849b8cdc588c60e005035f962
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://golowaki.ru/award?keyword=asepsia+antisepsia+esterilizaci%25C3%25B3n+desinfecci%25C3%25B3n+pdf PDF link annotation
    • https://cdn.sqhk.co/jadosoxiko/zijhrjb/1824470613.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/gfiiQhf/ninja_dashboard_cpa.pdfIn PDF document text
    • http://snapchat-alert.com/40880877047ek17v.pdfIn PDF document text
    • http://ig-copyrightnotice.com/my_computer_does_not_recognize_my_sandisk_mp3_playerfwuli.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/2002_ford_explorer_sport_engine_diagram4g2y7.pdfIn PDF document text
    • http://zimipodetasasa.iblogger.org/structural_engineering_reference_manual.pdfIn PDF document text
    • http://discout.online/ginseng_prices_in_kyysdge.pdfIn PDF document text
    • http://prodson.fun/korean_grammar_in_use_intermediate_audio_download4srqj.pdfIn PDF document text
    • https://cdn.sqhk.co/mubafazus/djg6hg0/civ_6_leaders_guide.pdfIn PDF document text
    • http://presentinsta.online/wepukitefalonadzri9e.pdfIn PDF document text
    • http://jushq.club/are_reusable_nespresso_pods_goodmiyw2.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/m1Nggjf/zefed.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/pogimenisurinefofojid.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/yardman_lawn_mower_carburetor_adjustment.pdfIn PDF document text
    • http://hightrade.club/attack_on_titan_cast_part_1wx6qf.pdfIn PDF document text
    • http://gatorama.site/boss_me-50b_bass_multiple_effects_manual6d1kb.pdfIn PDF document text
    • http://avtoshtorki.shop/allwinner_a134o83f.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/DqhfXje/75206206348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxesabefadufu.atwebpages.com/clasificar_numeros_racionales_e_irracionales_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd33d994-5d77-4438-ba7f-e29f248ea23f/kutapesamow.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/what_age_to_read_the_yearling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2249fc6e-12d8-4914-a8d0-ef18a73bf1c5/integral_of_xsinxcosx_sin4xcos4x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada573c2-20f0-40c6-9801-165e2bb48509/can_you_bake_potatoes_in_an_electric_skillet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14f0e3b-d73c-4ecd-b587-362b95fea36d/percy_jackson_cast_poseidon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5832d41-29b4-428a-9eda-c05e62b708b0/46258338016.pdfIn PDF document text
    • http://jegozejixal.epizy.com/haynes_carburetor_manual.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_off00014562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14562 5324 bytes
SHA-256: f2fec23c947ff2d2ef83fe3fe983ca490e88225ef8967c322d45e48e1672a27f
font_01_sfnt_off00015754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15754 13756 bytes
SHA-256: 89a4a642d3055532fe6a22c801f6c6a7e8ce9abfc1308c3fe9926ab50931af42