Malicious PDF — malware analysis report

Static analysis result for SHA-256 868334eb6f481454…

MALICIOUS

PDF

75.0 KB Created: 2021-06-09 10:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ab717df610c58c007b14e2e9d296128a SHA-1: 55321b2dfba0b4b3be3fadb59e8064e5c1b8b94e SHA-256: 868334eb6f481454719259a4e227d0147d8c296dab4691616c1674c66de56132
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The primary external URI points to a URL with a 'pbw' path, suggesting a link to a file-sharing service, and the ML classifier strongly flags it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt.

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://crysiq.ru/pbw?utm_term=anime+girl+full+body+creator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481069/normal_6063d235781ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_604dea1ad617f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_601d8f0bbee5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5ff36a5d29034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387428/normal_5fe8a5f796388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://didaneguk.pbworks.com/f/petty_cash_count_sheet_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d661be-273c-44d4-b99f-f251bd89b6bb/papas_freezeria_to_go_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba029d01-9326-4f91-ac4d-1cc99ccfde97/pogovaginexivujufavixu.pdfIn PDF document text
    • http://tirotibixup.pbworks.com/w/file/fetch/144620214/the_millionaire_mind_audiobook_free_download.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144423921/fire_hd_8_-_8_-_tablet_-_16gb_8th_generation_2018_release_-_black.pdfIn PDF document text
    • http://disisopaz.pbworks.com/f/apple_store_cyber_monday_deal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9823ea48-4f1a-4c85-b2e8-1340ee1845a5/barevanatubovarabe.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/airplay_app_android_tv_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ad9cf6-5689-4067-863d-5b5de2b7bf1c/how_many_classes_are_in_diablo_3.pdfIn PDF document text
    • http://bulafiko.pbworks.com/w/file/fetch/144759087/real_followers_5000_apk_unlimited_coins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254d378f-6b7d-4940-bbc9-fb051cd42d4b/pebusoxizaniminixazolot.pdfIn PDF document text
    • http://pajinap.pbworks.com/f/poultry_farming_project_report_4000_birds.pdfIn PDF document text
    • http://gulisapil.pbworks.com/w/file/fetch/144935655/kefatifix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cfaf2da-d36d-4c3a-b180-ad5bcd789033/100_deadly_skills_book_2.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/w/file/fetch/144919332/25332167637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc51bbfe-4b77-4b1b-8d2f-c35c0dbfacf9/13166286005.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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 5396 bytes
SHA-256: 56c2902c487f1923f94eef8f818184105562658b5e5f0c7fa49fa25cd4bb9e5f
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10564 bytes
SHA-256: 2d0969002ed68846f3d448e5a8f4fadff7467126510bd133f482e03b50018e2f

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