Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaada10dae42479d…

MALICIOUS

PDF

80.9 KB Created: 2021-03-10 20:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3593c462bc68a13b23ec2e24b5b03f1f SHA-1: 2b88baa2d5c50c606e3f6c957dc9294836e48b03 SHA-256: eaada10dae42479d93e4cdbd8cf7957eeb731fb80f28052d68be1d8392cca6fa
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm on disposable hosting, which is a common tactic for SEO manipulation or directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=acute+cerebellar+ataxia+pdf PDF link annotation
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/zavopakefakuvo.pdfIn PDF document text
    • http://nonly.xyz/61755830544jejlc.pdfIn PDF document text
    • http://segwaywheelchair.ru/pride_and_prejudice_by_jane_austen_full_moviebf046.pdfIn PDF document text
    • http://zathkatow.xyz/wixuxejefikafon319s.pdfIn PDF document text
    • https://jowavuzawevubab.weebly.com/uploads/1/3/2/3/132303017/nipolimi.pdfIn PDF document text
    • https://gukabezifom.weebly.com/uploads/1/3/6/0/136051166/tulekuxudegiwon_wunoxotivi_sugobovoz_senisafa.pdfIn PDF document text
    • https://dabefetuxof.weebly.com/uploads/1/3/5/3/135320161/6071929.pdfIn PDF document text
    • https://zosafetudosejo.weebly.com/uploads/1/3/4/6/134670517/e33c8.pdfIn PDF document text
    • https://febumade.weebly.com/uploads/1/3/4/7/134757335/feger-titufoxu.pdfIn PDF document text
    • https://xolivura.weebly.com/uploads/1/3/5/9/135958321/vegoni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e407a30c-bc3a-4ade-b910-ff0d75cdb891/tasapekogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c27d14-475f-4788-8e93-3b60e13619d6/kung_fury_trailer_david_hasselhoff.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_6377254e00dd457cb9d8cfc555a4b848.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_6e2233c93da64c5d95e355603c6e6de3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d9f946-461f-43d1-b5d7-c70ef0b6be52/titeto.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_fd59399412a941a1bfac4ac5bb9ca92e.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_d65598e76b5148bd9970ebe42add0645.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96a2c1a-41d5-4662-9dea-da244165437a/matlab_inbuilt_functions_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76a3f49-a221-445a-9bac-b9d765551b3c/12872067296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3e77b6-4d7c-4b56-aa9c-0a14182a1df3/how_to_avoid_prepositional_phrases.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_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 5168 bytes
SHA-256: db75584c1c988e9173b10e12af73d00eb420b94687a44f1f6b3021379b71ff16
font_01_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 10720 bytes
SHA-256: 59e18bba8a5c5ad2e57510e20eecc683f9b3b71713dd1c7c500c2b8033a08655