Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96c778694912fc3…

MALICIOUS

PDF

84.9 KB Created: 2021-02-11 03:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 547fece7d4c3f71c34ba0fe5dd23dbcd SHA-1: bb0ec693e8dabf2dec9f998f013d52644384f2b3 SHA-256: d96c778694912fc34437db9196c57684d4c1bf97eaad172178ed916cdd0646f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, which are characteristic of phishing or malware distribution campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the PDF as a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=jos+leduc+vs+abdullah+the+butcher PDF link annotation
    • https://cdn.sqhk.co/fasotaluvose/icHie7d/36880575135.pdfIn PDF document text
    • http://dafusunefu.iblogger.org/judex_priest_ragnarok_mobile_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/MhdEjjJ/40897764610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5ffaa82c47b66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388177/normal_5fcb9dac9b70c.pdfIn PDF document text
    • http://idealicait.website/502029631120cnoq.pdfIn PDF document text
    • http://detonic-romania.website/civilization_revolution_2_achievement_guide9ly0z.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/Hjc7fgj/xifevux.pdfIn PDF document text
    • http://gbarb.me/ben_10_episodes_tamil_dubbed_isaidubiuq8s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_6021c86fa52d6.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/69033726133s01si.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/breAHih/73005597852.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zomijoler.epizy.com/1045356130.pdfIn PDF document text
    • http://galojuxutiwas.epizy.com/cpsm_study_guide_2019.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_off00010d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 5216 bytes
SHA-256: 104f26587f4536225623eb02fb03a9aef2dfd9d043bd3ae5bbc5c1003a95d200
font_01_sfnt_off00011f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0C 11288 bytes
SHA-256: 2d1ed57810030b7962fe937dabcfc6a99e632b8269c38d679a027a8bdc0f0fe8

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