Malicious PDF — malware analysis report

Static analysis result for SHA-256 4781f71a9721af87…

MALICIOUS

PDF

77.0 KB Created: 2021-02-15 04:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: acd51b8a8ee1d3e239db6fe27a4db9e9 SHA-1: 261034a0d56d13d45dfa70feccfa161e60d24507 SHA-256: 4781f71a9721af875ff6949543a3c99968f0c62e54f17e1bb2b0d43f4717c9d1
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating a link farm designed to direct users to potentially malicious websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or content-luring attack pattern. No scripts were extracted, limiting the analysis of specific execution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/123?utm_term=griffin+ford+model+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375344/normal_60104b2064f67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fe0cb9017a82.pdfIn PDF document text
    • https://feveronibamuja.weebly.com/uploads/1/3/5/3/135300243/wepopujamiveva_vetonet_mimejixexipor_vafutusaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_60190c06e1f02.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/7b8151bd9.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/7006911.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/5045105.pdfIn PDF document text
    • https://febosefukeja.weebly.com/uploads/1/3/5/3/135324858/9668282.pdfIn PDF document text
    • https://xepevuke.weebly.com/uploads/1/3/0/7/130775471/xilidakurut.pdfIn PDF document text
    • https://fevuvewuvadudu.weebly.com/uploads/1/3/4/6/134650824/dudalopotisabu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/bhojpuri_gana_song_tinyjuke.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/exterior_angles_of_a_triangle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/reconstructing_native_american_population_history.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/fighter_jet_paper_airplane_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/jumoxotol.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/76956287811.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/sefamu.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/pagalworld_bengali_movie_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/25932412605.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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 4696 bytes
SHA-256: f0f32496488ac6aa0cbd2b0920f4e6edddd7c39ff01abb07fd2a685beaa53e9c
font_01_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 10648 bytes
SHA-256: cf54f841f715b7124eb60b0a0f991f076f65a06a1946c4669a2ca31740e9ab32

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