Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d2ad889b8e782d…

MALICIOUS

PDF

80.0 KB Created: 2021-06-05 06:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 09710bb3f1c7f06248892f08964cc791 SHA-1: 97bee26ce00e497bfc73ac4ad85431320a639393 SHA-256: 24d2ad889b8e782d158b79067bc3d007be1302dc1d91a7c21fb9eb1c2e7b876f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution. No scripts were extracted, but the overall pattern points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=personal+statement+template+for+phd PDF link annotation
    • https://vidigesiwixir.weebly.com/uploads/1/3/3/9/133997627/94126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_606949f9be8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_6015294ca9233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_602481301d505.pdfIn PDF document text
    • https://vifinijeg.weebly.com/uploads/1/3/4/4/134479412/nanasubo-xomegekato-zozenesigax-jafajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_601e814bc5d55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fe5141f13d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_600c217b9b02d.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/428e9532-e208-4bb8-af72-bb8e940827a3/bram_stokers_dracula_castle_scotland.pdfIn PDF document text
    • http://natizasex.pbworks.com/f/multivariate_normal_distribution_mean_and_standard_deviation.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144414237/17188455202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a218be6-abb6-442c-96cc-6652df959df6/the_beautiful_chaos_of_growing_up_google_books.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/simon_vs_the_homosapien_agenda_plot_diagram.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144536844/ejercicios_para_letras_preescolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2d2a00-1c76-4e6c-9284-995ec37312f2/gojutarutile.pdfIn PDF document text
    • http://kakexigodelo.pbworks.com/w/file/fetch/144546681/cheatbook_database_download_for_pc.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_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 5280 bytes
SHA-256: 33e7905fb96539cc561ea252b301a44227b6799aa07e6666a88edb2b4e7cc751
font_01_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 10780 bytes
SHA-256: 747d0c66c030fd2ffe72e22939aec81d1baf222057d9f2a2b38de7790bae6ef8

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