Malicious PDF — malware analysis report

Static analysis result for SHA-256 44840e4387775603…

MALICIOUS

PDF

115.1 KB Created: 2021-04-10 19:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb7e1071dd0776a32ea15d0ee32718b2 SHA-1: 87900e8e3038fe5364ef579ed54126b4a510ddd5 SHA-256: 44840e43877756038f94a59bb84cf0aa73502c1991f3562b7e72cef6dc2fb49c
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=why+is+technical+drawing+important+in+architecture
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/jimevepaxuvigigodafa.pdf
    • https://cdn-cms.f-static.net/uploads/4390383/normal_600fd7b69477f.pdf
    • https://cdn.sqhk.co/fumamimed/aijhbsE/69294006330.pdf
    • https://cdn-cms.f-static.net/uploads/4454967/normal_603d4b493bb89.pdf
    • http://kajuzumanaz.sportsontheweb.net/gesesomevawilurexez.pdf
    • https://pekedepak.weebly.com/uploads/1/3/5/3/135399439/5098102.pdf
    • http://xuwuvewisin.mypressonline.com/dumujezila.pdf
    • http://towufato.mywebcommunity.org/jetapunegexugojesed.pdf
    • http://sijiwepi.mypressonline.com/34323430535.pdf
    • https://mesofozup.weebly.com/uploads/1/3/5/3/135351624/dasumojan_bubarekazezunu.pdf
    • https://cdn-cms.f-static.net/uploads/4394060/normal_6036d6be91b84.pdf
    • http://zutatowatipo.mywebcommunity.org/how_to_disassemble_bissell_little_green_machine.pdf
    • https://cdn.sqhk.co/wanowofimaz/kQhdbih/real_battle_simulator_apk_mod.pdf
    • https://cdn.sqhk.co/velujuvaxal/2QHggha/naxuvisodowufatejam.pdf
    • https://lilobisuzi.weebly.com/uploads/1/3/4/6/134695815/dekexiratijufo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_ea1ba2a7387346ed98d853b99b3bb04e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9e73294-dc03-49db-8570-efd79119abee/8814872527.pdf
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_fd5f86c4f75e4991b723157659567e1e.pdf?index=true
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_798b0e3734804bbcb6c05c73d69fa68d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0b6408b8-7afc-49a0-af7a-f07a805ec5ec/69965876458.pdf
    • https://uploads.strikinglycdn.com/files/71062f52-d902-4d47-9516-a81bbcd24265/35291571018.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018451.bin
ae751e3d65eee3295220c72159a8985dd63628abcfce5c33627173815e48d0f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18451 5696 bytes
font_01_sfnt_off000197a4.bin
a86b47243490f643b6bddd14259dfe9db541e9f82b8e728041b02c00a1dc92b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x197A4 11128 bytes

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