Malicious PDF — malware analysis report

Static analysis result for SHA-256 345df1847131b2fa…

MALICIOUS

PDF

86.1 KB Created: 2021-05-04 06:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: edb03cb108211bd8509fd648f862f855 SHA-1: 9a0ac80a6d4f7c9e1c12fa0e079f1d7ed83c03f6 SHA-256: 345df1847131b2faccf9d34c5922d7996e2e13d72a0a3af99ed3eacb17f1373a
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which aligns with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=trombone+slide+position+chart+treble+clef PDF link annotation
    • https://cdn.sqhk.co/tudobele/4Z7hgji/universal_islands_of_adventure_rides_list.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/KtSjfjj/hashtags_for_likes_apk.pdfIn PDF document text
    • http://buybritishcat.com/778732086677w9o7.pdfIn PDF document text
    • http://clubstore.pro/vurezawavozbk353.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/ja31KGI/49736946058.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/ghekWhc/labive.pdfIn PDF document text
    • http://kekemubitaf.iblogger.org/eclipse_for_selenium_automation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovunebezub.epizy.com/burnside_high_school_uniform_shop_opening_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/43154899598.pdfIn PDF document text
    • http://vetanafajodomek.epizy.com/84964982592.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/how_to_pair_my_plt_legend.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/34526880842.pdfIn PDF document text
    • http://wawutanow.epizy.com/liturilino.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/11629983840.pdfIn PDF document text
    • http://kojevas.epizy.com/basis_sets_in_quantum_chemistry.pdfIn PDF document text
    • http://vuxetixin.epizy.com/fokajasol.pdfIn PDF document text
    • http://biwevugiwuk.epizy.com/bac_blanc_maths_terminale_s.pdfIn PDF document text
    • http://wifudozakiteg.epizy.com/vector_mechanics_for_engineers_statics_and_dynamics_8th_edition_solutions_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/biomedical_science_graduate_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/lesudavisalaz.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/92438549061.pdfIn PDF document text
    • http://kuposefo.epizy.com/gebaz.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_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 5484 bytes
SHA-256: fbc024345bb4e1b45d39f8134c8412a5d04c2644d1b7a759fe06dd7f50e23a99
font_01_sfnt_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 12204 bytes
SHA-256: 1a556ad03d577194afabdc15604b2893b5e97687589972b6726a5ba6013dcd72

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