Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4e42082f5b3881…

MALICIOUS

PDF

71.5 KB Created: 2021-01-06 04:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 17de1e0cae0060ae331d39e61ced08b6 SHA-1: 2a0e97e8b00c7db66d43ecfa20771cc7ae229a22 SHA-256: dc4e42082f5b388199d0af192d6fb6efa2933b9b2ea8dcfecb6b4dc1b49e105f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector and others forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://traffking.ru/aws?utm_term=best+songs+2019+playlist In PDF document text
    • https://cdn.sqhk.co/goluxewimabu/1hehOjd/rexolewivokazepa.pdfIn PDF document text
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/fitiranod.pdfIn PDF document text
    • https://cdn.sqhk.co/jisujesox/gahi2Hh/67974386366.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/943c40dc-c349-4a67-9b23-e8d4c2706de9/kivejevuxugomireb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d094694e-505a-4f0a-aa2c-eadf688359b8/demaguxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867d223d-2afd-4500-b2aa-a528fdd99988/51442316512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b6f07d-3776-433e-867e-df4f20a4a83f/49977415285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6a3d23-1308-4cac-a1df-446d66363af6/destiny_2_leviathan_dogs_map.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_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 5524 bytes
SHA-256: 3e2704d88d6372685c04bafe19637da12c04401a292e7840057d2c548cfca82c
font_01_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 10832 bytes
SHA-256: cc9e32cc905dc1a90497316845f97968b11d2dce15140be23b94b3a88653a7a7

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