Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c33e6f9d1040a9…

MALICIOUS

PDF

80.5 KB Created: 2021-05-06 23:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4153990353edeb64199d8f0a142500af SHA-1: af830b71d3dc52cca9ef17760d3a78f109052632 SHA-256: 67c33e6f9d1040a90bdb15063d753744c1177ecf63e71600ef582b199b654acb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=miss+america+acceptance+speech PDF link annotation
    • https://kisejugizojo.weebly.com/uploads/1/3/4/6/134656745/bozawo-bowube-kuzod.pdfIn PDF document text
    • https://cdn.sqhk.co/wusirilunoko/2gc4ehh/nipinubagazakudanewona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_600517949d20a.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/5906e54890869.pdfIn PDF document text
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/3101ea1519.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/pharmacology_mnemonics_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zozusexub/pgf2id3/suzudolu.pdfIn PDF document text
    • https://pekixozere.weebly.com/uploads/1/3/5/3/135397988/400e2a03d4ad.pdfIn PDF document text
    • https://puxasune.weebly.com/uploads/1/3/1/3/131379014/riwisuru.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/aTGFyhg/18613332198.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/gogepenuligewa_gigomitatezul_vuzezalunome_nuwivanek.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/zunulox_jejabukagusiba_dupedumexitase_surovonexupub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_602954a7bdaf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_602b68c8ddcac.pdfIn PDF document text
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/5551575.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/haij4ie/weapon_gun_builder_3d_simulator_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/gdLhdTO/4_pic_1_word_daily_puzzle_game.pdfIn PDF document text
    • http://supusatode.sportsontheweb.net/flight_stability_and_automatic_control_solution_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_600d709f59375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_6012245d527d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pozijawikubinun.myartsonline.com/sol_gel_auto_combustion_method.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_b2fbfe7d871645fb8999c9f9b82a3eb5.pdf?index=trueIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_9a085257081f42029b057128c9100ede.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 4824 bytes
SHA-256: ebb7c69deee866acc925ac01dc907451e886ff303461d68220be9b67a4d26345
font_01_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 11364 bytes
SHA-256: 5af735720edb6efbbbcbe06bfdcaedf326033ab4bff16bdc495f30dab2ea4078
font_02_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34