Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac823618f605e46…

MALICIOUS

PDF

73.5 KB Created: 2021-06-01 08:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: a59ffc702ae6ab34c69aa4ca8d51ea5f SHA-1: 16bcd79024d44808e7bde543960b6376543007f8 SHA-256: 6ac823618f605e4622b7d62998a9b203ea5fe9c380b7f86adf929e620b0a7f4c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary focus on `https://mezovuduw.ru/123?utm_term=autodesk+simulation+cfd+tutorial+pdf`. Heuristics indicate this PDF is a link farm on disposable hosting, designed to redirect users. ClamAV detection as `Pdf.Phishing.Trojan` further supports a malicious intent, likely to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/123?utm_term=autodesk+simulation+cfd+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460231/normal_601ddcb4c1ea8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452169/normal_5fcbee25801e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451377/normal_5fe4ed6a3e591.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459182/normal_5fdfeea8d0829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5ff2ba8e96d0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fd058b0c420a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_602866891cf6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144433578/deviation_of_beer_lambert_law.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/gufudowisalavavaresexad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc079d2-8674-467b-bac5-27bb6cee81ce/the_crown_season_2_episode_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5894cf09-d007-4148-9cdd-368d636a954f/what_does_enthalpy_of_solution_mean.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144445794/descargar_virtual_dj_gratis_para_pc_windows_10.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/how_do_you_say_sacroiliac_joint_dysfunction_in_spanish.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144426114/43051191102.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/negative_effects_of_corporal_punishment_essay.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/60775476912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f638a3a-ccb0-4a32-897d-e78d19687c45/12066572517.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/full_listening_-_new_format_-_toeic_test_2_-_2019_with_transcripts_and_answers.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144445164/how_many_calories_in_1_ground_beef_taco.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144431892/23019435226.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/605134733.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411627/81675001342.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 4032 bytes
SHA-256: 97c2b2e40c1385b4481fda1c9b3ae017bab0cd090847a61954886acf943b7a13
font_01_sfnt_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 5356 bytes
SHA-256: 037ed8c697230344e3a2469b8816fa671993583f2c759e5ecaae841d8a322b5e
font_02_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 11528 bytes
SHA-256: 91d39d32f28ee7e2d6831adac3195b9a6ff4ba8d596511dd02ed0cf33c51be2a