Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fbcffdd15e9918…

MALICIOUS

PDF

72.9 KB Created: 2021-02-14 02:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 16a4eb816613bdf9088d563d504fcba6 SHA-1: 988a72eae0a658a95d937d9abb01e65903234bfd SHA-256: c2fbcffdd15e9918b53295e3e65fae838118bf3052df3d5ef10fd63a2430c6b8
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or link-farming operation. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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 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://druttle.ru/123?utm_term=50th+birthday+cake+ideas+for+a+woman PDF link annotation
    • http://dihtyar.online/40021674876a0eub.pdfIn PDF document text
    • http://supewokabog.iblogger.org/apogee_ensemble_user_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_60108d4a50442.pdfIn PDF document text
    • http://reduslimitalia-official.site/mibaxosidibewosusesf82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419412/normal_5ffbdcd2b43c8.pdfIn PDF document text
    • http://trikolor.site/clinical_pathology_made_ridiculously_simple_free_download39u6s.pdfIn PDF document text
    • http://vulgargirls.fun/viwawiwogakekukuzalae3l0w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5fd845bda33d2.pdfIn PDF document text
    • http://1xbet-regi.site/magokagowij5vonb.pdfIn PDF document text
    • http://moresukko.ru/shrimad_bhagwat_geeta_in_gujarati_downloadmfb81.pdfIn PDF document text
    • http://pasendapp.online/zamogexesigaza0cmwq.pdfIn PDF document text
    • https://feminudusur.weebly.com/uploads/1/3/1/4/131407357/xoxurajomo_rinibijusorifin_tamep.pdfIn PDF document text
    • http://paganel.world/gejemefigekugipizozaneu2rkr.pdfIn PDF document text
    • http://fitness-ital.fun/66429953413wu3a3.pdfIn PDF document text
    • http://interstart.online/9217225452se1ud.pdfIn PDF document text
    • https://divowugu.weebly.com/uploads/1/3/6/0/136022164/paxujum.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/22428472633lnwra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 5796 bytes
SHA-256: 46f0188f8083a3638ef08ba33f2c9dba1405002ce3d86a549dd24f6d3a648f6c
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 10812 bytes
SHA-256: e07a8c3be5fc42286075cb75c17849f901bcb2942db2c4e15c3508e1bd428848

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