Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f803e8159c4dfca…

MALICIOUS

PDF

76.7 KB Created: 2021-03-18 05:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c07c51202c822bcc0ebc7c8e19e384b1 SHA-1: eb8ad959410d14a0921f08a786ad96dae19e0aa0 SHA-256: 1f803e8159c4dfca33636f923a0abcde6e031e4dfbd372fdf44558d91135808e
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a URL that, when accessed, likely leads to the download of a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated by a tool rather than being a user-created document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/123?utm_term=possessive+nouns+worksheets+for+grade+5+pdf
    • https://cdn.sqhk.co/sonorizeluwi/dhhjcnH/best_tiny_house_builders_uk.pdf
    • http://rafewasugajeze.22web.org/menu_costing_template_uk.pdf
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/fodebafurulasi.pdf
    • http://budokudepa.scienceontheweb.net/bomogebedufeji.pdf
    • https://cdn.sqhk.co/golemejexeno/DfxigJB/3278155967.pdf
    • http://wurilozi.scienceontheweb.net/best_pimp_rappers.pdf
    • https://cdn.sqhk.co/fofotixoz/TCUie66/drum_kit_online_keyboard.pdf
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/garefotalonujewa.pdf
    • http://xazoxaruxilovo.iblogger.org/animal_adaptations_worksheets_6th_grade.pdf
    • http://fibisazorowax.mypressonline.com/49574090184.pdf
    • https://cdn.sqhk.co/juvebuzizej/Boji1ib/download_my_hospital_doctor_game_mod_apk.pdf
    • https://soxotinimom.weebly.com/uploads/1/3/4/8/134883838/b5ebea.pdf
    • https://xixefofitajeres.weebly.com/uploads/1/3/3/9/133999179/rotosufokeju.pdf
    • https://cdn.sqhk.co/lakivasulis/akegd4z/tofudububupopifaxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://votitagupen.epizy.com/63622990227.pdf
    • https://uploads.strikinglycdn.com/files/c8cb534b-16b9-4d92-914e-ba841289b8fb/how_to_install_night_owl_wired_security_cameras.pdf
    • https://s3.amazonaws.com/waxegatulo/cpctc_worksheet_solve_for_the_variable.pdf
    • https://s3.amazonaws.com/padosumifubobo/18006302479.pdf
    • https://uploads.strikinglycdn.com/files/df32dda1-b103-4316-a96c-dd5c0727e17f/19064144406.pdf
    • https://s3.amazonaws.com/sumesawoxajew/4466887001.pdf
    • http://vuxepogi.atwebpages.com/pagokirofaguvaxu.pdf
    • https://s3.amazonaws.com/tobaziw/dow_jones_30_day_performance.pdf
    • https://s3.amazonaws.com/rorives/wallpaper_3d_name.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4f.bin
7675e9cd230d20d156d368e76bbe42f596b7f0ef649fe31e3bd81b4dcaf0c8c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 5612 bytes
font_01_sfnt_off0000ff85.bin
277d195486170ae312ac1be08e68dd0cd04f756ad710cfe4827b837297cfeaf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 11024 bytes

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