Malicious PDF — malware analysis report

Static analysis result for SHA-256 3959cfd1b6156c0a…

MALICIOUS

PDF

78.6 KB Created: 2021-04-23 23:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea93268e0d79a2c0220d0f1e927c8977 SHA-1: c7e558279262e6f6f18222b8d57458825397d8ca SHA-256: 3959cfd1b6156c0aaadf2f1fba2777acdeb6c19f2a44387c7decbab1e187477d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/strik?utm_term=how+much+was+a+pound+worth+in+1960 PDF link annotation
    • http://xexuxobofagidad.22web.org/gcse_further_maths_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406777/normal_605486f0f0ca9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5feb012b6c7b2.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/36015284646.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476750/normal_5fce38238d565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_5fe98fcb2492e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_604e7de81b33b.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/business_intelligence_techniques_a_perspective_from_accounting_and_finance.pdfIn PDF document text
    • http://nepajos.iblogger.org/the_river_cafe_pearl_river_ny_10965.pdfIn PDF document text
    • http://jofefipibabalul.22web.org/lawuwulerunuweverivomelu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kexomun.myartsonline.com/85414687834.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/retinoblastoma_fisiopatologia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f38463-c019-4879-a637-5536db3dc811/13546114003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bbac75c-6a46-42fb-b27f-d4f18fcf5156/why_is_my_pilot_light_not_staying_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e563286-1a6d-4dbe-baf9-928cfd2753f2/simple_present_easy_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/52155000455.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/reglas_de_acentuacin_de_palabras_esdrujulas.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/arrowhead_pride_injury_report.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_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 5836 bytes
SHA-256: eac5c8e5cb15edd71ffb637e389a42d50a4c38a55cde70cc3a5f7484b61dfec9
font_01_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 11100 bytes
SHA-256: aa416168fdeadd6bbc63545f07f1efb8884fd50fd3cf2bc2df38a1cff71ac1f5

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