Malicious PDF — malware analysis report

Static analysis result for SHA-256 da04d4942c2ed8ce…

MALICIOUS

PDF

68.3 KB Created: 2020-11-11 18:36:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bed18d013e1b14e9ab18e5d400439b9e SHA-1: 2e3dbfc6cb3db7ce17e2b1d247e0b6670fecf9fa SHA-256: da04d4942c2ed8ce9cc7ba4e0432767c037e1e7e5ca0239154da46bd672f0647
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were extracted, the PDF structure itself facilitates malicious redirection.

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/strik?utm_term=buford+t.+justice In PDF document text
    • https://xizidalubatud.weebly.com/uploads/1/3/4/5/134583516/kawetisudeziza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5f9a753386226.pdfIn PDF document text
    • https://roxoxurapu.weebly.com/uploads/1/3/4/3/134307884/nakizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f911ef4e0289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fa823253cf2b.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/tovamuw.pdfIn PDF document text
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/efbe013c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f9e30bee1fa9.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/3f3f466b-a4f8-48a8-84ce-dfeda86582ea/libros_de_artes_marciales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03660138-cac9-4c54-9e94-b91c2977f167/54416158935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d352b54d-91bc-4eb3-97f7-9099106fe312/lizesize.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/a_frozen_flower_korean.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/define_acute_coronary_syndrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f527d0e9-30be-4e5c-acfc-af6efd307099/fitixegir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f28d938-7960-4f63-a58d-91a5e5ff413b/56649647494.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_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 4928 bytes
SHA-256: 605cc16d0162da7cdafc23005d18aa8495c57657cb2e1db53bd2f06e0ffdf062
font_01_sfnt_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 10936 bytes
SHA-256: 5334ef99d973ab6f5f27375c6e66ed5a9a3ebe8ac7d5f3c46491ca0971666664

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