Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83f6c4537ef1dce…

MALICIOUS

PDF

65.8 KB Created: 2020-11-21 15:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9ddafb346b7c9b94e0f4bf731a822eab SHA-1: 753e0ab24b2e0fec42e280ba82ea09193c2b0558 SHA-256: c83f6c4537ef1dce324022d6bf64af12a16fbafc3524657ebbbed0dbd79281cf
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=the+docker+book+containerization+is+the+new+virtualization+pdf In PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/tapalisizemef.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/powatefakofuba_semogaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_5fa17df27a85b.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/e7fc5c9c-2d76-41c5-aabe-db53492703f1/ruxitiwefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c98c8a7-6bfe-4580-8a27-bbe73ea73885/87891460988.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/wakofokekijotup.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/38811840967.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/xanikarugiga.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/6th_grade_pre_algebra_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee56f28-826e-4cab-bc74-b568965a9c72/catalizador_peugeot_206.pdfIn PDF document text
    • https://s3.amazonaws.com/medadele/sig_sauer_p232_holster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f646eb9f-88df-40cb-89dd-9094da89688a/najed.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_off0000c3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 5600 bytes
SHA-256: 85e3a99c1a90d9800cf832e79f348812a459379f7950a23ebf3b8a82424179c1
font_01_sfnt_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 10408 bytes
SHA-256: 4229ec9b5453265d9525b91269751460d1e4b2823de9643f142372d130a06740

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