Malicious PDF — malware analysis report

Static analysis result for SHA-256 27487c2aeca98c23…

MALICIOUS

PDF

79.8 KB Created: 2021-04-05 18:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c76a0c0cb10eaf0e554894ec9214f4dc SHA-1: 658c68542d80bad6aaf887bf971b0a7eb537b24b SHA-256: 27487c2aeca98c231651b6a39ccc765503f239366a37fa917573e239d8ea00ac
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=agatha+christie+books+bibliography PDF link annotation
    • http://jamisixed.22web.org/97215841203.pdfIn PDF document text
    • http://vegefojafi.22web.org/85176787059.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/filexelimi.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/7882016100.pdfIn PDF document text
    • http://jidapuxedepu.medianewsonline.com/sikogamugowezafa.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/elgato_game_capture_hd60_s_requirements.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_600a24e576228.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/company_profile_introduction_mail_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407069/normal_601edfcf22dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_604b2c45679d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374359/normal_5ffd668713892.pdfIn PDF document text
    • http://narezekopalezi.iblogger.org/joker_dancing_meme_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_601760f61a8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_6014c8a397d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_5fd62cc9a3c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_60472dbeacf44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c24d0846-efa5-4754-a822-a7dc8f88f2d4.filesusr.com/ugd/7b2abd_1df333d044ba465282f2c6d194dbe27f.pdf?index=trueIn PDF document text
    • http://vusevupitiwo.rf.gd/rimudiromekovaworovesutoz.pdfIn PDF document text
    • http://baxedug.epizy.com/tatifafosum.pdfIn PDF document text
    • http://dopovis.myartsonline.com/77421820933.pdfIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_0fa7d30e5f39490e84b0754bd104685c.pdf?index=trueIn PDF document text
    • http://vekifaxofezawe.epizy.com/student_attendance_management_system_project_report.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/98639119173.pdfIn PDF document text
    • http://bujitajaxo.epizy.com/consort_medical_plc_annual_report_2017.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_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 5488 bytes
SHA-256: f6fa7ef5af241d89be4e6012b8b47a3f7a3b8ad7e344851610a372c0156774dd
font_01_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 11216 bytes
SHA-256: 83ccdc76e68af0662f39b2e4f555fb514fd3fbff8869a0afa12e44607890ed12

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