Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25a1be69c60b3d9…

MALICIOUS

PDF

71.7 KB Created: 2021-03-09 06:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e8190b3f98fb332ffd78de1b1b67dc24 SHA-1: 789c051e51672f9a68b9b203ad0766c3d7fab7fc SHA-256: d25a1be69c60b3d9504106fd14d227f343d6d21270d58bf7dfc01fffda975444
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

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://fokemale.ru/award?keyword=baixar+pdf+acrobat+reader+gratis PDF link annotation
    • https://neriguzoxivefu.weebly.com/uploads/1/3/5/3/135319498/kerajotixulijaniko.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/pidotizi.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/f6d0616.pdfIn PDF document text
    • http://goproits.com/59152636418xhuyx.pdfIn PDF document text
    • http://hightrade.club/is_dunkin_donuts_decaf_coffee_water_processedofi33.pdfIn PDF document text
    • http://marketitaly.info/minecraft_dome_schematico8l2z.pdfIn PDF document text
    • https://bixikobitil.weebly.com/uploads/1/3/4/5/134525497/6458759.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/cKjjihd/27706697301.pdfIn PDF document text
    • https://cdn.sqhk.co/rasadenibe/U1iiKjj/nitimijosukexopovikovobe.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/AEjiJge/57135043688.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/giKgf29/pesujegiwudobepudo.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/Rywjhif/80360763815.pdfIn PDF document text
    • http://sandiego-podcasts.com/62196031924ox8g6.pdfIn PDF document text
    • https://terulupi.weebly.com/uploads/1/3/1/4/131406892/musafitebik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_143a231f93864e31962cc7e8921b6ced.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_62bc4c753ae04bbeb7d8a4e988068a13.pdf?index=trueIn PDF document text
    • http://woporebokut.rf.gd/neburasawoloromaxi.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_4fa790e4fe934a169ccbc1033c3c32cc.pdf?index=trueIn PDF document text
    • http://notituzidudev.epizy.com/abdullah_yusuf_ali_quran_translation.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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 5548 bytes
SHA-256: b13cc3e7030f6512122c567173a3e66e38702c8c3e03a36706080c883da2b69f
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10196 bytes
SHA-256: adcf7298982f5ff2c866fcc8a78b9c01de9b7f4bbd4e345b2a86f73451de6649

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