Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab57fd240c25abc9…

MALICIOUS

PDF

68.8 KB Created: 2021-01-24 20:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2ce26966ec51e98c7ce7293efc58d855 SHA-1: 71ae1fe31febff52042d55c23fcddfa0000d626f SHA-256: ab57fd240c25abc956bc385e68d51476005541051c262b4e73c3496c52a75316
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, with a critical heuristic identifying a 'PDF link farm'. One of the primary external links points to 'http://bufo.online/kubojefoxosibitafulmzgiq.pdf', suggesting a potential download or redirection to further malicious content. The document body, though heavily obfuscated, contains references to 'fun unblocked games', indicating a lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/123?utm_term=fun+unblocked+games+tank+trouble+3 PDF link annotation
    • http://bufo.online/kubojefoxosibitafulmzgiq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385009/normal_5ffe8c576c41d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408485/normal_5fe54553bd4c6.pdfIn PDF document text
    • http://hookup157.fun/3d_car_driving_simulator_games_free_downloado78fl.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/jisutisupevoririlab.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/551586.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/kegaboteve.pdfIn PDF document text
    • http://galoomer.online/download_game_larva_heroes_lavengers_2018_mod_apkfr2ps.pdfIn PDF document text
    • http://eeeeeyyy.space/240670394723dnd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/baramati_map.pdfIn PDF document text
    • http://dokilenosabani.rf.gd/kuvikenupokafixirudo.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/diccionario_biblico_completo_gratis.pdfIn PDF document text
    • http://jonemif.epizy.com/factors_affecting_biological_nitrogen_fixation.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/wenomizufuwufini.pdfIn PDF document text
    • http://godemesefiw.epizy.com/abc_song_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/rumalofixikaparenaropexa.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/vadolexirawogagojotuwik.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_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 5580 bytes
SHA-256: c1f354095d73b04fea96e976f72728aaafafe139dcf69375b46503b0b7798b13
font_01_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 10572 bytes
SHA-256: 678cb44714d28cd667fed7aaf95071cde057c11cc8d77d23119e224f9fc77970

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