Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40925d28301d227…

MALICIOUS

PDF

163.7 KB Created: 2021-02-26 04:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 62260b867083919501e9736794cecfbd SHA-1: afd63db423572cb1c1dd66e712a9d474c59e01fa SHA-256: b40925d28301d2279508eaeff740c53bb8535929fdb8c8d4b5b5aa9d7494bd60
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely used for phishing. The PDF structure and heuristics indicate an attempt to exploit users through deceptive content, likely related to the 'caloric gas stove models' mentioned in the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=caloric+gas+stove+models PDF link annotation
    • https://cdn.sqhk.co/defisepeniba/bhegigi/artin_super_loop_speedway_slot_car_set.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/iScNWgg/83185648124.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/ijjxgfk/motor_vehicle_near_me_newark_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/pobusafi/DiTBhbs/bleach_brave_souls_battle_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rorexamuviz/dSojdKk/dallas_stars_hockey_team_schedule.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/free_hershey_bar_wrapper_template_word.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/ejdiijc/skywars_minecraft_map.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/rkgjjgc/jubimepida.pdfIn PDF document text
    • http://jodopafipunew.22web.org/wunurujekotelozitu.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/bbEUhcb/povanapi.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/Jhhjhih/omsi_bus_simulator_pc_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/cjc1idv/sunusigivodonovig.pdfIn PDF document text
    • http://fakibukilab.22web.org/78309127048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefefudu.rf.gd/demon_slayer_breathing_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/wing_chun_kung_fu_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/basketball_flyer_template_free_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/43436513500.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/cch_sa_file_b_ngc.pdfIn PDF document text
    • http://tokuloxigov.epizy.com/nelson_grade_5_math_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/bootstrap_form_multiple_sections.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_off0002468f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2468F 5224 bytes
SHA-256: d8793deb1f659056441718d007fe0129e625cac8f974f3901c94a6a9474d3d91
font_01_sfnt_off00025842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25842 12348 bytes
SHA-256: 19a56b336cafdb1a7281a9c35839975479c0237c364e3543ad05216a490a71a6

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