Malicious PDF — malware analysis report

Static analysis result for SHA-256 15973ddf876c0150…

MALICIOUS

PDF

76.9 KB Created: 2021-03-12 03:27:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7e0c53e7cf0c7f1b381a8c1b348ab479 SHA-1: 9fdfdb725373bee46a0dd2e8831bffbd2a04af89 SHA-256: 15973ddf876c0150caa37130a63d1da6b781450d6cab589ec7ec504d6a207fea
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a URL pointing to a site offering 'definite indefinite articles exercises pdf upper intermediate', likely a lure. The presence of numerous embedded URLs, many hosted on disposable domains, further supports a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=definite+indefinite+articles+exercises+pdf+upper+intermediate PDF link annotation
    • https://cdn.sqhk.co/wojipezusax/g62e7hb/music_player_lite_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/jihhdLu/59219448799.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/infrared_spectroscopy_absorption_table.pdfIn PDF document text
    • https://cdn.sqhk.co/kapopajij/2kWhgtD/bejekefe.pdfIn PDF document text
    • https://cdn.sqhk.co/botikavanov/jchdhfq/99145413203.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/fBhcggJ/80259667799.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/hggd6ji/lemetawuve.pdfIn PDF document text
    • http://zuvowizetigeko.22web.org/ezgo_golf_cart_charging_issues.pdfIn PDF document text
    • https://cdn.sqhk.co/fusureviweki/gkFjjOE/tuner_z_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/metumolalub/zhfqM4w/my_company_hospital_game_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/jigixomavola/FggiaZj/chicken_rice_soup_poultry_seasoning.pdfIn PDF document text
    • http://zakukat.iblogger.org/notepad_html_format_shortcut.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/he1gFAM/27367057085.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/4WhjI9S/39193804140.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/ddnja0q/zovobexox.pdfIn PDF document text
    • http://lodubesemo.iblogger.org/impreso_disconformidad_alta_medica_inss.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/OphhAsQ/fibonanubixalun.pdfIn PDF document text
    • http://maluxevuno.22web.org/manual_de_bpa_agrocalidad.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/jhcia1k/26305154116.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://banumekopi.epizy.com/zogevorutujebenot.pdfIn PDF document text
    • http://fasufigosekuwuw.rf.gd/risujutipedisu.pdfIn PDF document text
    • http://riwekijeworore.rf.gd/basic_electrical_engineering_interview_questions.pdfIn PDF document text
    • http://xejawaji.myartsonline.com/80918667310.pdfIn PDF document text
    • http://gavoditi.epizy.com/joxine.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_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 5368 bytes
SHA-256: 6eb297b83a86e06b4c9c5ea3246158e638ed183ee465198731d836c0f03cbf4b
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 10468 bytes
SHA-256: 951b602b55ac5f9addcfe422b3354c318caad5488b3e49224b18eee62c069f66

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