Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd2d9c9a8d508b2…

MALICIOUS

PDF

73.9 KB Created: 2021-06-13 12:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7b827aae11991ce7ad6b9fcf0c3e9576 SHA-1: b6acd0e17184ea08946bca6ef614467d2f7d9f47 SHA-256: 0dd2d9c9a8d508b24f5fcec4bc0270c5d995f9b8c3732bba8b1c8ffc8c9afe5c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/pbw?utm_term=long+multiplication+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450351/normal_5fcaec90bb404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444874/normal_60211614e41d2.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4376629/normal_60b1be419cd84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_6042fa379ce76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_60321884ce92a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_606de5f7158c0.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/794b332c-15db-43e1-a7f2-41dac204af0b/zaromabovuropoludarajapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe1a28f-e644-4340-bbb8-15c9d412e2d5/what_does_bonne_chance_mean_in_german.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ef5e6e-46ca-4635-a47c-93d64fb4f1ea/40_hp_tiller_handle_outboard_for_sale.pdfIn PDF document text
    • http://wepadigisita.pbworks.com/f/xozogaxagekudabewor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf7777fc-a540-43d1-9935-7ad47ca1587b/63756417202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/556a26c6-7d21-4531-8f85-514f44ab4182/76623910203.pdfIn PDF document text
    • http://xewubamefa.pbworks.com/w/file/fetch/144678516/45872134332.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/geometria_y_trigonometria_de_baldor_nueva_edicion.pdfIn PDF document text
    • http://bugedavamib.pbworks.com/w/file/fetch/145216794/sarkar_tamil_songs_mp3.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/kakebunowadulome.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144443076/what_is_the_fbi_fitness_test.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144570117/cnc_machine_ebook_free_download.pdfIn PDF document text
    • http://selapiwilapa.pbworks.com/f/19284118922.pdfIn PDF document text
    • http://xivoxibuza.pbworks.com/f/kizizemapetezesupurov.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/145120662/wexufugijugexubo.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/lasifosugimemone.pdfIn PDF document text
    • http://xovelezid.pbworks.com/f/power_system_analysis_and_design_4th_edition_solution_manual.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_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 5444 bytes
SHA-256: ecc1231fed5a1f8786974f519e178b942862350a3aea5bd15f4adda02b4303f4
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 10424 bytes
SHA-256: f5d3cc730d56361f9fc797a121a92e67938caa4f89ca3e2eebdc3b0ee5a19a8d

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