Malicious PDF — malware analysis report

Static analysis result for SHA-256 d333b124b7dcb3be…

MALICIOUS

PDF

73.5 KB Created: 2020-12-29 17:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fa11491809ddcbe31648c951475822d5 SHA-1: a76f87be7c4dfd9a42c6b4d3f01bc661e0cfe90e SHA-256: d333b124b7dcb3becc789bd4590a71b833efdb70664fa6b136b27e53351df960
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

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://traffine.ru/strik?utm_term=gopro+max+360+price+in+qatar In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f95f5d85d9ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_5fd17205eb9d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5fa4d4710e992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_5fa650651bd8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_5fa7aef972bf3.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/3a71d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f9c0f99b201a.pdfIn PDF document text
    • https://futisukafasuku.weebly.com/uploads/1/3/5/3/135345320/6944470.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/e46bf873fc900.pdfIn PDF document text
    • https://wowavimisaken.weebly.com/uploads/1/3/0/8/130814021/15cb71d29d86018.pdfIn PDF document text
    • https://nusuxedusikuj.weebly.com/uploads/1/3/4/6/134620646/e5927d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_5faa1b685e0f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fe70e0ec2eaf.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/908968f1-a433-4c38-b906-14d5998aaa5f/jitugesowaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b221590-7fbc-4658-880e-b7e479b4e30c/26279279280.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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 5556 bytes
SHA-256: b01b7ef2abef2a9f5a162450878458ba48cb2fdca8baada236d9bfd1418a47e9
font_01_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 12008 bytes
SHA-256: ea6387a3d147178853361814f1b6e866f52a38625f2fbaad23c2744a3f2f97a1

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