Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f5696e0984dfe5…

MALICIOUS

PDF

74.8 KB Created: 2020-12-21 16:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4cef55896a8cba00d0942a2875eea17e SHA-1: ee5e9a4dc96e69529fd170595da5486c5a869b05 SHA-256: 21f5696e0984dfe5c540734b8909db8aeb36d42ea14fd2f15fabd8353919c1dc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, disguised with a seemingly innocuous query parameter. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URI are sufficient indicators of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=2nd+grade+math+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f8971a2dc14a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5fa035134a68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457854/normal_5fd5faeea6941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5f886e0861c33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_5fac2e9dc64d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448740/normal_5fcbcb485a815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_5fab1df0ba707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5fc9e525614af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5f8ce8c310319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5fdb7506d60b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_5fbadb10b3774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475715/normal_5fc8b73516637.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/4b613b49-10be-42e4-baac-a0b92bdbceed/zineluvufakavevuju.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54f005bcb0228a29fb6e5/t/5fcb0ecb1ef6d1662fe86e70/1607143116744/drag_car_racing_v3_hacked.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_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 5552 bytes
SHA-256: 0c791c038da78dab702c01d9331b4d13d2209dc483f2d94e6c8e80e5678b2de8
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 10880 bytes
SHA-256: 69955c001f362e1267bfb3f6a2df5419988e90b35638b6c8265644389c5c8369

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