Malicious PDF — malware analysis report

Static analysis result for SHA-256 098cc73eed0bf7bf…

MALICIOUS

PDF

74.6 KB Created: 2020-12-31 11:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e68f0a7f57632c6a6cffcbe59b18a802 SHA-1: 7bf5bff43e68fe649fc70879e16d2a212fe4fa72 SHA-256: 098cc73eed0bf7bf2fd28812aee2b11fc7767fe9ac07dc063b12fc4e8d8d510f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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 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.
  • 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://trafftec.ru/strik?utm_term=island+stars+hockey+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fa9113d75e67.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/agfygdR/zombie_frontier_sniper_mod_apk_v1._27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_5feb6c4ceae46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_5fa513909a66a.pdfIn PDF document text
    • https://jopovasido.weebly.com/uploads/1/3/4/6/134619877/19499.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/idxhfVh/sodium_ion_and_chloride_ion_electron_configuration.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8d0d3f8aceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f895fe816b7b.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/289da9a8-67e2-4bc6-b87e-689b9ea921b4/how_to_recover_deleted_instagram_messages.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/xilubojegipiroramokizinab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9aa85d2-af0f-44be-a757-ac3bde3fe2cf/business_research_methods_rutgers.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_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 5404 bytes
SHA-256: d7900c34ccc7c40e6200643cd7bf2ec8ae79ac378f8b882c8ebb0426f08cf326
font_01_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 10780 bytes
SHA-256: 06aab9857332b7698b65323000c5ddde3c1904967281f967f903b0d248672ff5

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