Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efd21aca438f361…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 10:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fb96c7cece3b785c71495e183b0ecc2 SHA-1: 28dd40c1aa437b49dd0414198d0e2f9eb29eb45b SHA-256: 7efd21aca438f361c86e9bfd394e09362ba31d3e4ee079f378b403f3590fa0d0
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'dafemum.ru', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, contains keywords related to financial documents, supporting the phishing lure.

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://dafemum.ru/award?keyword=balance+sheet+of+any+company+pdf
    • https://cdn.sqhk.co/kitolitik/hiphbge/call_of_duty_warzone_wont_download.pdf
    • https://cdn.sqhk.co/vimewiki/ghajihh/21780881910.pdf
    • https://cdn-cms.f-static.net/uploads/4446772/normal_60471f53d8566.pdf
    • https://cdn.sqhk.co/kokedipemi/gcFkvha/exit_managed_home_screen.pdf
    • https://cdn.sqhk.co/zerurukoraju/c80ihha/zombie_killer_game_online.pdf
    • https://cdn.sqhk.co/xamitarerivu/ghcjhjv/ba_dum_tss_sound_button.pdf
    • https://cdn.sqhk.co/zuwiwejagub/esfhfid/ruferid.pdf
    • https://cdn.sqhk.co/kowipopi/qihakhi/46464331710.pdf
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5ffbe19948bbd.pdf
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60222efa72ef0.pdf
    • https://cdn.sqhk.co/devisofage/Hdhdkjf/12315648419.pdf
    • https://cdn.sqhk.co/gadukupuwe/kja9jat/argos_white_triple_bunk_beds.pdf
    • https://cdn.sqhk.co/lojumisebu/iigjcFE/fozakemaduj.pdf
    • https://cdn.sqhk.co/dutaxato/fFpwoSn/doom_eternal_walkthrough_ign.pdf
    • https://cdn.sqhk.co/gonolesuzam/iiOMH4K/88142953117.pdf
    • https://cdn.sqhk.co/panafilaputu/ahbjap4/password_list_maker_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sakaburepagase/how_do_you_fix_a_pendulum_on_a_grandfather_clock.pdf
    • https://s3.amazonaws.com/xojafemori/xadedudinegizokovabitib.pdf
    • https://uploads.strikinglycdn.com/files/f5026db4-3b73-4fdb-b6f3-2690447bad81/microsoft_access_2013_tutorial_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/57347beb-e9fe-4314-91ff-ee38b26c69e1/74840184639.pdf
    • https://s3.amazonaws.com/novifamigot/suposofunezu.pdf
    • https://s3.amazonaws.com/zijivevip/block_story_mod_apk_unlimited_diamond.pdf
    • https://uploads.strikinglycdn.com/files/80a7bbd2-2069-45c5-9f03-410e2cd626bf/wabizukerapo.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_off0000f0f4.bin
c36881e936f69f53c53eae19546d5977580f3315f627ab755c5994779b403ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 5452 bytes
font_01_sfnt_off00010368.bin
4d5f8dee4716cf0c60265a75aa25e0885ae9dfde306df6fe93c77b1b0e4f500d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 10352 bytes

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