Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c4166b43b3c1fa…

MALICIOUS

PDF

64.4 KB Created: 2020-11-10 23:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4dd10d2ef1a6135273800c4d53bd4f4d SHA-1: c12e3a6e8047c9e9746e315a991ad60be102c248 SHA-256: 80c4166b43b3c1fa0b0b6b61dff1aa5c22908983ffaafde1af42c3d964713859
214 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, which is part of a link farm designed to distribute malicious content. The embedded URL 'https://traffmen.ru/123?keyword=download+kakao+talk+app+for+windows+10' is presented as a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?keyword=download+kakao+talk+app+for+windows+10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8b74146a5a7.pdfIn PDF document text
    • https://wuwilosuz.weebly.com/uploads/1/3/4/3/134394730/gipaxixalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_5fa3a214c119a.pdfIn PDF document text
    • https://fejalunaruxepiv.weebly.com/uploads/1/3/4/4/134489653/xagovusenamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5f8936112bd42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5f9a69868996c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_5f9c027e3659f.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/1327f3bd-f499-42db-8315-ede4f2be9e43/72556059499.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/jilakofutob.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/xosevufidiziwonapi.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_off0000bf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF36 5384 bytes
SHA-256: d25ccefd7fae9a13e5add26549609aa7c233f1e509430ce7f57a748a50715bd7
font_01_sfnt_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 10284 bytes
SHA-256: 05603e3ffe8179d08036d4a3bcffc5dcd47596e4be1d449563f8234763e8740f

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