Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c53674a69b0c45…

MALICIOUS

PDF

91.7 KB Created: 2021-03-29 16:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ac6caeefa4cdfbea60392935efd7e87 SHA-1: 8543ddd8b61fae30be21d71899ac7f5a7eaaacec SHA-256: 10c53674a69b0c454b24ff2cbad7d22c6aa86c417e356c155fbc3b2232732ab8
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains references to 'English speaking grammar practice pdf' and 'wkhtmltopdf', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=english+speaking+grammar+practice+pdf
    • https://cdn.sqhk.co/suzeboxiwo/eYkjgge/full_screen_whatsapp_status_video_download_2018.pdf
    • https://cdn.sqhk.co/kagurase/gjpsVjC/english_songs_for_kids_free_video_download.pdf
    • https://cdn-cms.f-static.net/uploads/4378852/normal_602d303ec4373.pdf
    • http://rumokerejimo.iblogger.org/fisher_paykel_fridge_water_filter_installation.pdf
    • https://cdn.sqhk.co/wixexozesila/5YoZSMc/xosedesekasafifoxasop.pdf
    • https://cdn.sqhk.co/runudori/hhaR4gg/letavuwi.pdf
    • http://xipevufizokev.iblogger.org/telecharger_clavier_android_azerty_gratuit.pdf
    • https://cdn.sqhk.co/dijogiper/ihfygjl/35232627181.pdf
    • https://cdn.sqhk.co/wuwosexed/aliggij/photo_collage_software_free_download_for_windows_8.pdf
    • http://dixajadabaw.66ghz.com/print_address_labels_from_google_sheets.pdf
    • https://static.s123-cdn-static.com/uploads/4425908/normal_5fee96f6cd053.pdf
    • https://cdn.sqhk.co/kitaparek/bwBIOja/foe_helper_chrome_old_version.pdf
    • http://kafalogu.22web.org/ap_seminar_irr_examples_2020.pdf
    • https://cdn.sqhk.co/xalurubizud/SngghaB/10892435496.pdf
    • https://cdn.sqhk.co/wifavizen/2mgihh1/anime_gif_wallpaper_pc_4k.pdf
    • https://cdn.sqhk.co/naliwanik/iejeiiU/75208268505.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedojigudaj/energy_merit_badge_worksheet_answers.pdf
    • http://malebujezasipip.rf.gd/lewibip.pdf
    • https://s3.amazonaws.com/toliwudalamem/aws_certified_solutions_architect_associate_syllabus.pdf
    • http://regipikiwubadov.epizy.com/vifidegoguzamagerusi.pdf
    • https://s3.amazonaws.com/nedijowewoded/lotonivawizenaxojofaduziw.pdf
    • http://sewobomek.rf.gd/nebiveniveno.pdf
    • http://fofanab.epizy.com/24813753713.pdf
    • https://s3.amazonaws.com/voxazedisula/98254444372.pdf
    • http://tizebowikono.rf.gd/ketosis_diet_meal_plan.pdf
    • http://nawaroxepemif.epizy.com/95046410024.pdf
    • https://s3.amazonaws.com/baposivarabuj/2006_nissan_altima_maintenance_light_reset.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_off000128a9.bin
d88f5be1ad4bad49135117ee16a72b6947894521862acfd85d20d606b2a57142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128A9 5592 bytes
font_01_sfnt_off00013b8c.bin
b84edf73daf679dfed3389e08e2188ccf6ef2ee67eb629da723e7168a6cb79f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8C 11036 bytes

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