Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a19c7fe12772a83…

MALICIOUS

PDF

71.7 KB Created: 2021-03-05 06:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17d47aa4d1df84470d9997bf27622923 SHA-1: 951bd91da4c0a82fdfe10e82142bd172fa5053e1 SHA-256: 3a19c7fe12772a8315ebf6b17ac65cab3c7785c8c7e69a0d2fc8b84842d236d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=salem%2527s+lot+1979+full+movie+dvd PDF link annotation
    • https://cdn.sqhk.co/zoturisa/iifcnic/powder_game_2_save_data.pdfIn PDF document text
    • http://nupubidodeje.22web.org/god_cut_songs_masstamilan.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/animal_planet_documentary.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/hfuLhjY/final_fighter_apk_obb_download.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/hcE7Y7u/revenge_of_the_machine_spirit.pdfIn PDF document text
    • http://dazemuwemez.22web.org/54334894419.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/hj8kZic/disney_cars_mini_adventures_race_rods.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasujenijasezos.rf.gd/answer_to_divorce_complaint_michigan.pdfIn PDF document text
    • http://kokitivem.rf.gd/sandisk_mp3_clip_jam_vs_sport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8388e8-1e0a-4d0b-b445-2f36ed1691ea/fluval_305_setup.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_c3745043d3a442769bd65f9b27a7a902.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17db15c0-9aa8-417d-b967-a546bc0ec95c/lessons_learned_in_software_testing_a_context-driven_approach_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16dc5b33-33f7-4c79-bf40-2d6e928be261/bipepevekotuminiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11dae16-4627-4009-92aa-238211756fd6/xinev.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_468927b1d8b446e9aa69c5ca8d046c13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/786e70ed-f148-4f82-b073-a1f8774772cf/what_is_the_salary_of_phd_professor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde7aa0c-a46b-4c03-918c-c6178eacc799/harry_potter_film_2020_date_de_sortie.pdfIn PDF document text
    • http://laneneloko.epizy.com/austin_how_to_do_things_with_words_summary.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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 5440 bytes
SHA-256: b330a1db849379440c0faf509f2add919a2562dc95bde9831f342252198fd8c0
font_01_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 11384 bytes
SHA-256: f7f9a0fbd99365837767fe2aaf1df94e2f7725d0860360f39c4b52305c546f26

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