Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd115c72ad5c0159…

MALICIOUS

PDF

68.9 KB Created: 2021-01-27 11:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 71266bf21eb7a7b1648ffed5b470e877 SHA-1: 90a8eb16b29990125e3aae9bb20ae3f545d5dea1 SHA-256: bd115c72ad5c015969cc56be0b70602dd1bf1b7ec0d2c2a5360c9e1dafa4df93
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed for redirection. The presence of 'utm_term' in the URL suggests a tracking mechanism, common in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=rc+boat+propeller+kit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426556/normal_5fd2253f3a2ba.pdfIn PDF document text
    • http://intereriia.com/basketball_world_championship_20208zisu.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/968e7c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fcda0ebf2064.pdfIn PDF document text
    • http://ighelpcenter.xyz/nemor2jayq.pdfIn PDF document text
    • http://sosed.market/sapusoterepivucu9b9.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/vomemow_nugigugere.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
    • http://zumewozuzetarun.epizy.com/3564510379.pdfIn PDF document text
    • http://veguxakafopuvix.epizy.com/maputuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/operatoria_dental_barrancos_5ta_edicion.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/raxupiwoxuza.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_off0000c159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC159 4644 bytes
SHA-256: 723e2a9d28d7e1d22360a1dee0c11d0af66d07e43e949e20998aadcba8fbe8db
font_01_sfnt_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 12532 bytes
SHA-256: 25e5e682aa883891574f5b434f71f499753ddeabadb2d5451b53229b4fc2bee5
font_02_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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