Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d905402af70f39…

MALICIOUS

PDF

98.7 KB Created: 2021-03-03 01:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1e0336c8bff415f85b120723cb213c10 SHA-1: 5b55d5edd84e292d7c70eb4ca86af7bfb65096f9 SHA-256: 54d905402af70f39dbce597b792b4da4fa2e16f2d9ef76b4c32418a51b4c21ee
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to a link farm, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect the user to malicious content.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://fokemale.ru/strik?utm_term=what+is+the+thesis+of+the+communist+manifesto PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418370/normal_5fcdbfe6d1d71.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/62563107436.pdfIn PDF document text
    • https://kizevopizimi.weebly.com/uploads/1/3/5/3/135351298/1cd478d30db515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_601a9bf4f077c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469641/normal_60034242bdeed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_603d8ddd57ad4.pdfIn PDF document text
    • https://cdn.sqhk.co/fidegelotag/iaeKjeU/drive_by_shooting_in_brooklyn.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/driver_vga_lenovo_g40-45_windows_7_64_bit.pdfIn PDF document text
    • https://favexolifuluk.weebly.com/uploads/1/3/6/0/136092880/gukinixovirozis_wuxozorevuva_jivonuwegoruma_napamuregojera.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/calculus_of_variations_with_integral_constraints.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fd27ff6d5321.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://s3.amazonaws.com/gajabedafot/89502106441.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/modefurivuzas.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/vesugelen.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_off00013a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 4888 bytes
SHA-256: 298f51a079293d4acdde71e15902018c7f5a4026576a6de578330d93663343f8
font_01_sfnt_off00014ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC8 10632 bytes
SHA-256: 4d32581f90c73271f4297d229c0f2413b549809a52c7ac266136b7522205e303
font_02_sfnt_off00016f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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