Malicious PDF — malware analysis report

Static analysis result for SHA-256 35297db9b9ef4b49…

MALICIOUS

PDF

70.6 KB Created: 2021-02-11 10:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 8922d30db18d9346b8a735c78ec58e3d SHA-1: 384c0ad4effd031a335abb10a46e069534862bcd SHA-256: 35297db9b9ef4b4970249c2ec71e5d42d60d4b6e49ec3ad31f2ecb50b08cdcc1
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=easy%20clarinet%20sheet%20music%20free In PDF document text
    • https://jujipepovoduvu.weebly.com/uploads/1/3/4/0/134017188/6532686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fea241e50865.pdfIn PDF document text
    • http://arenaprobet.com/statics_and_mechanics_of_materials_5t4upt.pdfIn PDF document text
    • https://fozirufimagez.weebly.com/uploads/1/3/0/9/130969558/felami_galeruvibupofi_zajifajozelenam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499636/normal_5ff9afbcac856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421474/normal_5fe44af7dcc76.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/5198823.pdfIn PDF document text
    • https://gumopaxegekugod.weebly.com/uploads/1/3/4/0/134018731/malis_kezesufivusafo_mogidin_befowojivalow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_6023ce327f48b.pdfIn PDF document text
    • https://zetodimamewiwek.weebly.com/uploads/1/3/2/3/132302859/bomiluvazifi.pdfIn PDF document text
    • https://nobopejulalajib.weebly.com/uploads/1/3/4/6/134621416/80b9a877.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/losarejogen-kulixe-leruj-nobutuz.pdfIn PDF document text
    • http://justamorem.com/20907803835nkm6s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368224/normal_60032c5acb9ce.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/d2838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 5180 bytes
SHA-256: edfe4bfb285e8b4708ffd93d190551d8290bfe1afb7696818926e63b9a568486
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 10624 bytes
SHA-256: 3b1a67e8e0361e1a6b7a43a68e52cfcc9b04e01679b4372950a867b12fab2122

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