Malicious PDF — malware analysis report

Static analysis result for SHA-256 918acbdefef5a205…

MALICIOUS

PDF

74.3 KB Created: 2021-02-24 20:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 899976a45de15f98b61761f39183a10d SHA-1: f497c02d969401a95ece516002a2fbc36a8d820e SHA-256: 918acbdefef5a2054e303b41ff164acc1c746855c2cca97a01488e62565bd920
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring the user to external malicious sites via these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=genre+of+the+secret+life+of+bees+novel In PDF document text
    • https://fusikejasuk.weebly.com/uploads/1/3/0/8/130874124/217854.pdfIn PDF document text
    • https://dabosimupit.weebly.com/uploads/1/3/5/3/135397997/50b19e843cb.pdfIn PDF document text
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/77a27766ee58.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/figofofeseruw.pdfIn PDF document text
    • http://tutavizukatafoz.22web.org/kosher_guide_johannesburg.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/nimotamadozi_kexamileve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5fd03de1c5663.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/gajopivivakori_kulikefob.pdfIn PDF document text
    • http://zotokes.iblogger.org/back_to_you_lyrics_video_free.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/jixeremipet/gaxugipuxupobawewena.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/82754028361.pdfIn PDF document text
    • http://wuvuwipiwizovid.epizy.com/dixitufaw.pdfIn PDF document text
    • http://voputujewijozej.rf.gd/cost_accounting_powerpoint_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/borami.pdfIn PDF document text
    • http://mifamin.epizy.com/weather_report_kannapolis_nc.pdfIn PDF document text
    • http://losisotudek.epizy.com/uber_analytics_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/bensoul_favourite_song_video.pdfIn PDF document text
    • http://jisufuwoj.epizy.com/41822745622.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_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 4992 bytes
SHA-256: 1ae84e1b52e89630c8b15f974807fb7fa54c741532c738cf7d9c6afe6d2a9ba2
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 11148 bytes
SHA-256: a2dfdcf8206615fdad3d1fc6c6973a8308c03cc8ac806db4ab27097184799830

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