Malicious PDF — malware analysis report

Static analysis result for SHA-256 3959c9a5430cc372…

MALICIOUS

PDF

79.4 KB Created: 2020-12-02 01:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 64b8c5c1a73c6abd1b3aeab009ef8b53 SHA-1: 7f94566940ffdb266f7b60bd2136808f686b256d SHA-256: 3959c9a5430cc372bb5cc7e4e6951bacb5829ce5d29a8257fbb3f879f9a80719
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://traffmen.ru/123?utm_term=privilege+power+and+difference+3rd+edition+pdf'. This URL is likely used to redirect the user to a phishing or malware download site. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing pretext.

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
  • 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://traffmen.ru/123?utm_term=privilege+power+and+difference+3rd+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5f9292c4735bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_5faa719f0d0cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f872c4058cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4526930/normal_5fb2e70a4276a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f9f6647f1a22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480591/normal_5fbb6c0e655f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_5fa11980ae937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_5faf14cbd6bcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f8f692c50b1a1e77efcd/t/5fc21ca43f75b166431c219c/1606556839286/75887952016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec81e08-e56b-43ae-82ae-1a60d4dc931f/9076958368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d259c112-4262-468b-a89e-4c34f3000b05/rekoguxexobulavuvijow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e6f511-2026-4122-a922-891fe956bcdc/4108809479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace126a7-fbf9-4407-8253-3c94fb26fb7a/57834795843.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58624bd14ff0dd2bbf2b9/t/5fc665c3f81c9a2a0c7f2325/1606837700384/91140459076.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85C 14820 bytes
SHA-256: 41de46b2ac53ec73b18db4fbd55a16c02084ee0682ffbf858357ec75b7f0f27b
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 5460 bytes
SHA-256: ee2ab31301c65b56045163da422b7e67c870c87a9f7fada8a308403e05097418
font_02_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 11172 bytes
SHA-256: 963edb22293cf27d56d93c97357fc1a282fba550bca751d737dbffbc9e1461da

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