Malicious PDF — malware analysis report

Static analysis result for SHA-256 86374928f1fbd6e5…

MALICIOUS

PDF

85.5 KB Created: 2021-03-18 08:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8ae5c9e0b205d50c0754dae0d50e25df SHA-1: 39f9367a708e940cef7d7391a1b27b9d40dff886 SHA-256: 86374928f1fbd6e58e717ae6fb4b965b1f4fde8603d68ffa7f9d3aac7e5781c9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting it functions as a link farm or redirector. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute multiple malicious documents. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm structure strongly suggests a phishing or malware distribution campaign.

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://resalured.ru/strik?utm_term=diccionario+biblico+vine+en+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494877/normal_6029fb6d8fcb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_60159aea3b5d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_602ebd3c3fa61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5fd8f744d7349.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/maxcare_extended_service_plan_phone_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5fea1d1fa6296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472475/normal_6043fd440d0fe.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/db5Izhi/high_sea_saga_mod_medal_only.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/pXBOgfq/temple_run_3_play_store.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_600e48b754886.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/zenimibimomatuwujivibe.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/vkhggiY/radio_fm_online_planeta.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/hdjj8jb/85791217867.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/defense_health_board_reports.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_602230236f04c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitulogakapede.myartsonline.com/kenmore_elite_oven_not_working.pdfIn PDF document text
    • http://lexamokoxerum.atwebpages.com/how_to_turn_off_brinks_security_system.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/borogezegafabozuj.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/introduction_to_time_series_using_stata_sean_becketti.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_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 5336 bytes
SHA-256: 69a78448e382197068a043aaa5a45f5fab33559956f06b2b6dfedb9249b4db95
font_01_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 12304 bytes
SHA-256: 4cc3541722ed57ec37db83466b5f485bf4b86172be62b123d053f6efa65da20f

Open this report in the interactive analyzer, or submit your own file for analysis.