Malicious PDF — malware analysis report

Static analysis result for SHA-256 d632e8e5a7f294a3…

MALICIOUS

PDF

73.5 KB Created: 2021-03-20 13:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3c003bd425e45e825e471115561a3fe2 SHA-1: 06c0125f35e800b7025d95b806ff8d8639a134d4 SHA-256: d632e8e5a7f294a3a574c75bd57dece5825f0380dd65054255a94af9cd5d90dd
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, 'https://fokemale.ru/award?keyword=accounting+rate+of+return+method+pdf', pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to distribute content from disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=accounting+rate+of+return+method+pdf PDF link annotation
    • http://luwogexejel.getenjoyment.net/attack_on_titan_manga_last_chapter_release_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_6040115668d4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5ff9ea2e9fa9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_602d0c571be2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377120/normal_5fffda8ccff1b.pdfIn PDF document text
    • http://notanowid.22web.org/wusikogi.pdfIn PDF document text
    • http://damezevuba.iblogger.org/ramezefudumodupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382948/normal_5ff0499748d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_601fbef77677b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexugemo.epizy.com/gta_online_guide_to_businesses.pdfIn PDF document text
    • http://midetawedafete.epizy.com/gowedumegipiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c4d86d-21e9-452b-a71a-24879ab9e322/the_republic_of_sarah_premiere_date.pdfIn PDF document text
    • http://rakorexifaxokur.rf.gd/nafokaxisasufugokone.pdfIn PDF document text
    • http://tifuponakeg.epizy.com/lufurupoja.pdfIn PDF document text
    • http://riwusuka.epizy.com/73550459947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8803efe-9a1b-41eb-8ae5-9260e096b1d5/xenenunofun.pdfIn PDF document text
    • http://divakupi.rf.gd/q_es_clulas_falciformes.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/nclex_rn_example_test_questions_with_answers_and_rationale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254a9f84-47a8-40ea-b22b-a458de0eed0f/91038373030.pdfIn PDF document text
    • http://zumikatumisi.rf.gd/how_to_make_an_advent_calendar_out_of_toilet_paper_rolls.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_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 5348 bytes
SHA-256: 75866e88edcd529e8aace992bf8c93528c359e9c828029f03fe43f41896cf6f2
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10736 bytes
SHA-256: 034622da3a3b984805004dac47be071412f9475865bdab20b71b3ebb4ed9290e

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