Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa839c85d8c1e1cc…

MALICIOUS

PDF

61.9 KB Created: 2020-11-14 00:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f93c75e5359445531ce47dab14e85058 SHA-1: 767ff47878384f032e676d175e4955d625e5df7b SHA-256: fa839c85d8c1e1cca91f004f048244c6b9369fbec3c2d28d43b9d5c41428c4fd
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://gettraff.ru/123?utm_term=psu+unit+for+gtx+1660+super In PDF document text
    • https://rowiranuzexu.weebly.com/uploads/1/3/4/4/134436227/tawon.pdfIn PDF document text
    • https://nokurujifeseg.weebly.com/uploads/1/3/4/3/134355409/daketusasetalopujexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f8c91d47f3f0.pdfIn PDF document text
    • https://bujezabuzi.weebly.com/uploads/1/3/4/3/134310034/9409759.pdfIn PDF document text
    • https://wukemurorafol.weebly.com/uploads/1/3/4/3/134338373/6462556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_5f9d3ee706dc1.pdfIn PDF document text
    • https://zoliparudoluja.weebly.com/uploads/1/3/4/6/134662317/cbc73dd16009.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/08d3cbded.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/goxaxeburepot.pdfIn PDF document text
    • https://pumizisumene.weebly.com/uploads/1/3/4/0/134017803/4634148.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2f50e778-3af8-41ce-93bd-71ec429266fb/frsky_qx7_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e595801-45c5-49cb-b155-41e987a7023e/johns_hopkins_internal_medicine_board_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/12616751428.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E6 5128 bytes
SHA-256: d320d0e66e4d1a2ac44db282b45442d1af8f0230d2f2827d17f3464ef946a04c
font_01_sfnt_off0000b773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB773 10420 bytes
SHA-256: b2099faae1c27b89a891f5fc44793f7d126a7902a014ee60fe5c3fc7cc99ca94
font_02_sfnt_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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