Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fe9df11870ee65…

MALICIOUS

PDF

88.1 KB Created: 2021-03-12 10:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9e4927678a87055a7037ef77b3546119 SHA-1: be9fadd8c2d1869881253823c14d3425a07c189c SHA-256: 28fe9df11870ee65a95e0bbe90d1e4cf7a2be2947afc82ec36f0d7a992d7a026
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Mathswatch ratio homework answers', aiming to trick users into visiting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dugedepap.ru/123?utm_term=mathswatch+ratio+homework+answers PDF link annotation
    • https://cdn.sqhk.co/rirakibugo/BPeHiah/cool_car_racing_games_free_online.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/63785047507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_5fdc6bd7651a2.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/E3whiKT/rock_music_ringtone_mp3_download.pdfIn PDF document text
    • http://mupejejewij.iblogger.org/baburao_bagul_mother.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_602995304d63a.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/how_to_install_universal_steering_wheel_control_interface.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/pedikojuxokimaso.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/jbNM6hf/pixel_free_fire_battle_royale_offline_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478134/normal_5fce179edae7c.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/auAMheN/tubbo_x_tommy_fanart.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/jJgjgjC/zonuwiva.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
    • http://lanelubeberasi.rf.gd/philips_avent_manual_breast_pump_sri_lanka.pdfIn PDF document text
    • http://nigugolesaxof.rf.gd/corrugated_sheet_suppliers_in_dubai.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/accident_reporting_site_hse._gov._uk.pdfIn PDF document text
    • http://dijutago.rf.gd/best_emulator_frontend_for_android_tv.pdfIn PDF document text
    • http://nilevividik.rf.gd/93757535463.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_e77f003d3a654fe59ae123a8f7127985.pdf?index=trueIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/what_to_reply_to_a_one_word_text.pdfIn PDF document text
    • http://gisesufuxezemud.epizy.com/esophageal_cancer_powerpoint_template.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_1fbe95f374f94feabc145c37b5135b07.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 4956 bytes
SHA-256: 86f7d9a1123b4dbef4b4094589fbf7139f9408abb351373a159235d27ff53112
font_01_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 11796 bytes
SHA-256: 1adbaccac6571493980d1880f87b4629d94c5876b04725b4feb9e630a4009096
font_02_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 16088 bytes
SHA-256: ccf42771811f3bfcfc4881e0ea26c61020463520b77f542a172ed5d532e4d210
font_03_sfnt_off00014457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14457 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34