Malicious PDF — malware analysis report

Static analysis result for SHA-256 accdd4b8ac0af244…

MALICIOUS

PDF

88.7 KB Created: 2021-03-28 00:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b16ad73178f79ce21f474e5c4d0de3f6 SHA-1: 7875d4ad2192f9dd285dca9629fee8e67682495d SHA-256: accdd4b8ac0af244e1a664666bd4cb9993e87380d0e398afc7f6eacbdd997d19
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, with one pointing to a URL that appears to be a redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of a link farm and the overall structure suggest an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=the+mystery+of+the+missing+red+mitten+activities PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/603982e6-e7c3-47f2-b87a-9f8a7c20dbd6/wf-2630_change_ink_cartridge.pdfIn PDF document text
    • https://3c1ad7ec-bfc7-452d-a92a-0d22078d3251.filesusr.com/ugd/c6e823_a1b28585114d47058f14129b3f45dca4.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_bda9fe13d9584a7cba6031ede8bd7776.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_51d8e7e566624b45b1720d5e5584d77a.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_6e2f4aa0887d4ba9b2fb670c623f3f14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b250a3-0fbc-42ec-b5b5-695ad476462c/92131322138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72d3ffc-1991-4bd4-b38a-adfb89d06cb8/kivefimakasixewegaduviziv.pdfIn PDF document text
    • http://xugojejusovofeb.rf.gd/silaneselonef.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_7961e78de82a460194d108be967befb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f9dd22-1003-4a9d-a5ee-98acc04e327c/lalirajurinavux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9916d02-6a02-4876-afe2-b7151dba473b/how_to_understand_math_equations.pdfIn PDF document text
    • http://kateporabub.epizy.com/can_you_take_your_learners_permit_test_online_in_virginia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d6d4a4-0326-4920-9a31-fc98cc871fa7/tosugixabanutebulu.pdfIn PDF document text
    • http://vebodowumiba.epizy.com/40523252133.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_dc9e3eb0484c4fa1bb2b7ad12da66b52.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_9d07e88c93594f93a15b56bd7d2ea112.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace4b248-c99a-4e78-b512-2b094f78bc7b/day_of_the_dragon_warcraft_3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fee3c36-7567-4593-9813-83ee2ebca515/fundamental_analysis_of_stocks_in_hindi.pdfIn PDF document text
    • http://gedonoseg.epizy.com/t1c_qcy_review.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_ac3f3c28c25b4c30b81c43ae8c0bee8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9dc5e7b-839d-4edd-b8f7-786ed4247074/17794533511.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_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 5512 bytes
SHA-256: 8730a3f4493442a44a2e9192861a9b46a13f03a1fdc44b6c6927fae6015fbebe
font_01_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 11196 bytes
SHA-256: f64ae2d8cc52994b09e7837c78095db9313b8aa167b3e81032a5e978bffcb3d2

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