Malicious PDF — malware analysis report

Static analysis result for SHA-256 008454cff6e71439…

MALICIOUS

PDF

72.7 KB Created: 2021-01-17 10:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 283ac3da54fd6e787ea02e1e4edb7e89 SHA-1: cd3dedb8e8f834a1ff8ee9b1beeb848001bb27d4 SHA-256: 008454cff6e714391f5884242f749782aa1da0a8939c12cd32920a276cef5372
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to various PDF documents hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

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
  • 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.
  • 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://trafffe.ru/aws?utm_term=inspector+morse+theme+sheet+music+guitar PDF link annotation
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/noxanotujikojoxevi.pdfIn PDF document text
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/verifoburur_lepetutiri_gupopifeniwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374696/normal_5fcb8f54d564d.pdfIn PDF document text
    • https://cdn.sqhk.co/ligazupevu/fgehdps/76561805893.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/B8gihfe/color_palette_from_image.pdfIn PDF document text
    • https://cdn.sqhk.co/somujatiza/iaQLihZ/1782927167.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/norixerowiromemidu.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/5000144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_5fb4ccb628584.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/nxgePjh/musicals_on_broadway_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_5fbfae6344237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5f911146bb5eb.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/jhUjdgj/77256372138.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/d7426a0f0c6072e.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/wesun.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubuvajaroxe.epizy.com/academic_advisement_report_queens.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_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 5252 bytes
SHA-256: c6152d658692263ea07e9b8f883ba58d3da2ae83501f13288c47ab1bff19afa9
font_01_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 15932 bytes
SHA-256: 3e1e404ddde247ba99918425fe87eec94d24b75c1de923abdbd2bcd996471fc3

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