Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b043909bda8cba4…

MALICIOUS

PDF

76.7 KB Created: 2021-03-30 15:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31eb4dcb559322b2523e4c6467121682 SHA-1: 5f07684a79bf82d46af302966702bd86f6f513ac SHA-256: 3b043909bda8cba4762eca380872158681f911e90d6562afd97e1886b2fef8d8
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one specifically appearing as a search result for a downloadable PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/award?keyword=the+blue+planet+3rd+edition+pdf+download
    • https://nudabubi.weebly.com/uploads/1/3/4/3/134323665/jujot.pdf
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/bulizar.pdf
    • http://s7hmus.org/hot_deals_on_wheels_olympia_wa67pdg.pdf
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/29202.pdf
    • https://digulowewuw.weebly.com/uploads/1/3/4/3/134363346/6579975.pdf
    • http://gesetaxoxu.sportsontheweb.net/all_of_me_piano_sheet_music_easy.pdf
    • http://amst-watch-v2.club/dyson_dc39_animal_vacuumf9d6m.pdf
    • http://nanebaxexob.getenjoyment.net/mubifinodanufexajalifinuf.pdf
    • http://lubevos.scienceontheweb.net/sociology_optional_printed_notes.pdf
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/foposofurin_lesut_pefenazokakus_firowukivo.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://basagutidabe.sportsontheweb.net/49436690829.pdf
    • http://orehi-siberian-force.online/present_continuous_tense_exercises_for_6th_grade5h2wy.pdf
    • http://tk-pobeda.site/economics_of_development_perkins_5th_editionw1ecc.pdf
    • https://defeluzeveloj.weebly.com/uploads/1/3/0/8/130873982/nixorivamonunob-femujo-nugitemi.pdf
    • http://kitafoged.medianewsonline.com/momonitevu.pdf
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/bibukuwuki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e926bafe-b389-4d47-9b8f-2ebdf7b282a2/braava_jet_m6_vs_roborock_s5_max.pdf
    • https://s3.amazonaws.com/zizene/sumege.pdf
    • https://s3.amazonaws.com/faluzotixupi/vobixisi.pdf
    • https://uploads.strikinglycdn.com/files/55da729c-7810-495f-ba1f-5028947db69f/types_of_forces_and_definition.pdf
    • https://uploads.strikinglycdn.com/files/d7727994-dd10-41bb-89d1-0d5d7f8163b7/hp_monitor_going_to_sleep_no_signal.pdf
    • https://s3.amazonaws.com/sumesawoxajew/berkshire_blanket_queen_sheets.pdf
    • https://uploads.strikinglycdn.com/files/c811e3ed-f5ac-4f07-976a-b38e26900782/lajezedof.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_off0000eee1.bin
93ac3c3adab7dc7bc216a36d10e70b58857d0992e2e7ee6251bd27d2aebd790d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 5296 bytes
font_01_sfnt_off000100e6.bin
a4757f44f58dd41da3fedbd007dda7397ac43ee4f9a789468144d4c408ccd084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 10628 bytes

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