Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e766e10b2ba431…

MALICIOUS

PDF

79.7 KB Created: 2021-04-10 22:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dbc7f553fa4572668a3711592e026911 SHA-1: 75365a405d4cde7a63622af374732125ef158527 SHA-256: 74e766e10b2ba43138a665b9fa8fbb446b78abf31023e5e86b3c5c5832f6fa4f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://resalured.ru/strik?utm_term=how+much+do+criminal+investigators+make PDF link annotation
    • http://gesemalisezusa.iblogger.org/bomberman_apk_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/Njghaja/60124884392.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/iiicieC/jalatixinivukuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_603acfcaac6dc.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/eheieih/44050892179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5fce1800a64e4.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/4PGgjih/bounce_house_rental.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fd87b6f2b021.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/lehaAgd/color_therapy_an_anti-_stress_coloring_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_60285f12d987f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_84da91e07222485494cc71e88e326bef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/383e69b7-f3d3-42e5-837f-cb5919aa6741/1580473933.pdfIn PDF document text
    • http://tamakibegotilo.epizy.com/best_post_workout_stretches_for_flexibility.pdfIn PDF document text
    • https://8d0be05a-57f9-45aa-9c43-986891652c28.filesusr.com/ugd/55f640_3a26c31dff674e72bf1c03a50acff5d3.pdf?index=trueIn PDF document text
    • http://keximidurowu.rf.gd/spotify_free_for_pc_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/48764318508.pdfIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_9ca4b839b38740bcab4b6c64385d7bfb.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_c72f4070cacd4145a547228e2329cc42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dupula/proof_david_auburn_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ce8598-0165-4ebf-b1c6-f1f615eaf46f/75694321778.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/balance_general_en_forma_de_cuenta_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006d3a6f-4c41-410d-85fc-5929ee084486/88564656311.pdfIn PDF document text
    • http://vasugam.rf.gd/surufuvibixet.pdfIn PDF document text
    • http://tudulem.rf.gd/free_bi_weekly_budget_worksheet.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_61493b11f94b46258842e9da900d0132.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujapu/didowitenurowo.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/securerandom_vs_random_performance.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_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 5532 bytes
SHA-256: 71c64dcf1ca062f3af19060aa4f185529b2e29e169d1b4a8d3a602111abcb8a5
font_01_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 10944 bytes
SHA-256: 9d2f1bb5c6529eef83481cc1fe69383e480e69a94363e8740fa5a6991d35054f