Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d10c9fb8d18084e…

MALICIOUS

PDF

63.9 KB Created: 2021-01-01 21:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8ebd2155f5b01646318b55654ee93be3 SHA-1: f827c242a9563e3b644353bc43ee605bcc343c07 SHA-256: 3d10c9fb8d18084e78e1c6b759bb7bcb90508eda2eac7a2062ca3150da267fa8
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The file contains a large number of embedded URLs, suggesting it is part of a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate its purpose is to redirect users to potentially harmful external sites.

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
  • 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.
  • 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.
  • 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/wb?keyword=vexilar%20battery%20weight In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fca3e50372fc.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/hGhbehE/moxonolegefegegata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375699/normal_5f92631ed5e80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_5fecad8c749cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_5fbdc73ecfeae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5fa173d1ee8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_5fbeccdd9ff7d.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/7991905.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/ce8766af-4288-4692-96c0-642eac53da81/minecraft_tnt_run.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b7799b-dcea-40cf-a3f6-728d83e73c31/48326391941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15391da7-0194-470d-8e2c-5d22e611a37f/96201422833.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_off0000c03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03C 5136 bytes
SHA-256: 9942676b04adcc92ba0d5321b8b1da62f57aa74031db5880ec07133859acffc8
font_01_sfnt_off0000d1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CF 9804 bytes
SHA-256: 91965e472514b6e8fe43c761f7f1d9e257a973df518c985d4f65fd80a129e98e

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