Malicious PDF — malware analysis report

Static analysis result for SHA-256 79601cb63e8ec965…

MALICIOUS

PDF

78.0 KB Created: 2020-11-11 07:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8cc681a1196b25d097ef7a8dc65f359d SHA-1: 2034f5ee2e67eca011bc8fe0cb53f6b0d4324964 SHA-256: 79601cb63e8ec96589f31a89ac403a0e3decf46d29d8272c757fbb32b4dc49a5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/strik?keyword=classroom+timer+countdown+online+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f9fdb2adbd03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_5fa15c707105a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_5fa6cd9f3e698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5f9f81d468f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_5fa05e0651bea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5fa49d3a1f68c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/kodiw.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/21499629988.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/47020220930.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/alphabet_russe_prononciation.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/renogufizidoxebopiz.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/zozuxilase.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/17645106911.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/possessive_pronouns_esl_worksheet.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_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 5164 bytes
SHA-256: 8031e635b1df007ed9bb9af154199bc78228f87134f1b8c11842679855e3d06c
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 11128 bytes
SHA-256: 76edf039e0693e6acb0ec01942dc8900f62d92fc3e76f5b0f7672129e6da73ff

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