Malicious PDF — malware analysis report

Static analysis result for SHA-256 3653e7d599f9b177…

MALICIOUS

PDF

85.2 KB Created: 2021-05-04 13:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a0e3d36bcbd4c5d7585ef2fb1ced06ef SHA-1: 6e2dba9dd1f8605d6a3d38a512851b251ff6e76d SHA-256: 3653e7d599f9b177206862d4bf6595b7d4a6870b2087ef9be93d3d10aff9e741
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to direct users to malicious sites. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=traeger+tfs81pzd+owners+manual PDF link annotation
    • https://cdn.sqhk.co/nurijodefa/bvTe1ih/simosujaf.pdfIn PDF document text
    • http://good-production16.site/84891348187lw2cp.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/hiEhjjb/94878357540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_605ff35e43e7f.pdfIn PDF document text
    • http://kodiludo.iblogger.org/flapjack_recipe_healthy_food_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/chbw3rA/26816877999.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/diffusion_of_innovations_5th_edition_doiuffzj.pdfIn PDF document text
    • http://eurostore.info/88493278147b7y5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_6027094985616.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
    • https://uploads.strikinglycdn.com/files/c6666f39-a7d9-41db-a652-bd0ad6b4b7fb/is_hp_officejet_4630_a_laser_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/62511553201.pdfIn PDF document text
    • http://sokozivale.rf.gd/siklus_akuntansi_pemerintahan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfd21fd-198e-463c-b065-d1ab9c724fa2/descargar_ana_gabriel_discografia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ccae04f-6db4-460c-b6e2-262f5ac41ce1/11861448058.pdfIn PDF document text
    • http://pomezisil.epizy.com/men_s_boxer_briefs_pattern.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/business_proposal_letter_samples.pdfIn PDF document text
    • http://jumezezufa.rf.gd/the_cognitive_behavioral_therapy_workbook_for_panic_attacks.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/challan_no._281_in_excel_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4479e14d-2027-4e4b-bb9f-94f9cf7b3b2d/maintenance_engineering_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/19326128988.pdfIn PDF document text
    • http://wixarebetiz.epizy.com/78879752746.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_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 5532 bytes
SHA-256: 48632b399315b869debb4385f73d6f8bdd69c4741fc60ffd68481884ea69d1ec
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 11824 bytes
SHA-256: c03e316ce6fc70d7eaa201260423de129235b991d79df5d7276b9fc3be8ca8ce
font_02_sfnt_off000138ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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