Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b3cde75ca54064…

MALICIOUS

PDF

72.8 KB Created: 2021-02-27 12:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 84d3122cf41ed72f6feaa9e637b5c06c SHA-1: 0aea282445fbf568b4872259c07179ff5f446ec8 SHA-256: c4b3cde75ca54064499e1b247e787de0d8bb0f7ceeaf24b473917afc235756f3
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/award?keyword=how+often+to+replace+dyson+v6+battery In PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_5fd84f6c9b2c8.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/kajabub_zenipoje.pdfIn PDF document text
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/bigevuv-kezerizoxudoro-vipafifapin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424683/normal_60078658ecf0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_6015194042fd1.pdfIn PDF document text
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/6780126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486965/normal_5fe0d2177448a.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/bissell_lift_off_multicyclonic_pet_vacuum_filters.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/classification_of_words_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_603576a9361e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_602f34c978110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_601a6f419edad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutejaxevewef.myartsonline.com/dekaperon.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/56329451393.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/asbestos_roof_sheets.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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 5656 bytes
SHA-256: 6ac7872a1073716eb952a468b921cc2bb482635e51dc7ec20d3e5938aa7aa0cb
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 10620 bytes
SHA-256: 147c09c7ff07b5587054a9914585a55231e5e685667c78415ba49b49f232d9f7

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