Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d74233426cce007…

MALICIOUS

PDF

71.9 KB Created: 2021-06-08 17:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 45fc185984d67aa9655cbc36e386b133 SHA-1: 53dfae4f3837de4d224496ae7787cbd3351f3aa7 SHA-256: 6d74233426cce0071478ff6bd38dac6f1bf3b7a906721a972f0aca4b4c388c59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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://infrive.ru/pbw?utm_term=calculus+early+transcendentals+11th+edition+anton+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421199/normal_601d2a975ef4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_60186a262a81b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_6063077c57b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_60168c1a87502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_603942a900c33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lomubel.pbworks.com/f/douglas_county_school_district_salary_schedule.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/f/fabrika_retim_takip_program_excel_indir.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/mechanical_engineering_aptitude_test_questions_and_answers_download.pdfIn PDF document text
    • http://mozodeguzazu.pbworks.com/w/file/fetch/144838461/bench_press_workout_plan.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/woted.pdfIn PDF document text
    • http://felinemumivu.pbworks.com/f/sulonetodipugopunipag.pdfIn PDF document text
    • http://kevesefazoga.pbworks.com/w/file/fetch/144811893/kurerotefab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9bde48-4293-4248-86c3-133552462cf1/78969985988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7678f2d-166e-4831-a595-59c47758c809/what_does_open_gym_mean_in_crossfit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f510526b-5f98-4602-b5b6-b1dbac19ea66/gurofafuviwaluxaravegago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6367915f-6529-4102-be47-b649b430beb5/the_chronicles_of_narnia_prince_caspian_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0038cb4-398e-4a16-aad9-e598db17c764/how_to_clean_the_igniter_on_a_harman_pellet_stove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0239e23a-a048-40f2-9ef1-77e1ae116ebd/38553904729.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/70016118299.pdfIn PDF document text
    • http://daridameku.pbworks.com/f/mazojinugipuki.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/dinenufo.pdfIn PDF document text
    • http://wemekojezum.pbworks.com/f/raxutawinotela.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/xuzumarifal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa57a92-d7f6-4e76-b428-ce308c985926/64523563858.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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 5392 bytes
SHA-256: f3a226febdc53435901b7d4e9d25ee8eaea93d6e3a8ec33dcbadbe495c2a8b1b
font_01_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 10600 bytes
SHA-256: 0e0715db72ec09cf7653d94d9d8a067ea8040acad75b26cd9156b71670ebdf0a