Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfa7aced93e131b…

MALICIOUS

PDF

86.3 KB Created: 2021-03-15 02:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1794fa2c42e07a297da45f8a3f8086f2 SHA-1: 6020affde61e367ecbe602b0f05bf8364d8b980f SHA-256: acfa7aced93e131b5659e2de478baa88a3140443e87327bab341e8563ccdcc4f
226 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and ML heuristics. It contains a large number of external links, suggesting it is part of a link farm designed to distribute malicious content. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line interface, a common technique for executing further malicious code. The embedded URLs are likely used to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://kuzutuzo.ru/wix?keyword=wrist+sheath+pathfinder PDF link annotation
    • https://jasenumuruj.weebly.com/uploads/1/3/5/3/135309327/9983260.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/ZQhbhcs/62322444736.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/8619358.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/marofedagesagirogolak.pdfIn PDF document text
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/pikamak-nasotalapadafag-wenubademogogo.pdfIn PDF document text
    • https://cdn.sqhk.co/rumunefa/hhLWwhg/rufufinivo.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/hBgd21h/63264907149.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/igaifKv/bailey_and_love_archive._org.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/33086fd0100f4.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/dark_souls_3_anri_armor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_02ae3ef176364fef8bcbf2e45cbb43d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af616c69-314b-446e-b79d-1e73e603f7fa/data_management_executive_salary_in_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470dafee-e4de-4fd8-bb06-4d9d04f95908/fiwafewune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1442725c-bfbb-40d6-8caa-ab6056076da7/33444567627.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_aa69b5c6143d4aa199b94c30b5ee4d4e.pdf?index=trueIn PDF document text
    • https://6f29901e-f5c9-4775-879c-97b2de5c8d5b.filesusr.com/ugd/0bf195_614b490281644fc0806a8ca7238b55b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfdecf2-c01e-4c7b-a271-a49f302e225c/sebarisorujusadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e2d756-95e5-4823-861d-15eb365412c9/80047568174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63479fd-b2b4-4b05-9715-a31ca1aba43a/wupijixulebezumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff04109-7806-4248-add6-1f9cd58f4f0e/gonididorese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a014c8a-9a30-43c8-a25a-1327313a7b11/89192520162.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_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 5108 bytes
SHA-256: 72f1f1f75a75ffac05cc518fb9410aa86c4b79f06eb2574bc7a19256ca3c336d
font_01_sfnt_off00012a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A02 10120 bytes
SHA-256: 5ed490d4d642dd034489f7f8ac53fcd43089ed6d8bfa350d8c953be31f54ceb6

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