Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8d41ded6768562…

MALICIOUS

PDF

74.2 KB Created: 2021-03-17 18:30:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: da90f6880823f25138681453185a3b4e SHA-1: bf719f9c35e2674d3714ebf4fd250e0a8d758e12 SHA-256: 3f8d41ded67685626a9582bd8510c93968f9b1619195cb856949bf3c8ac79b88
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=melee+texture+packs PDF link annotation
    • http://nidewopovuwubo.mypressonline.com/ejercicios_de_trigonometria_resolucion_de_triangulos_rectangulos.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/gaxumakepoke-muvavuru.pdfIn PDF document text
    • http://spiritstudio.ru/31020776678h52we.pdfIn PDF document text
    • https://wubiwadodeta.weebly.com/uploads/1/3/4/5/134577579/0027f2cbfa5c37.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/jokewidolibolede.pdfIn PDF document text
    • http://bagawixaj.mywebcommunity.org/dawurukelokakigavidiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vudebalox/jgge0ic/rich_girl_shopping_dress_up_fashion_games.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/Rsegh4H/my_verizon_wireless_service_is_not_working.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/2883720.pdfIn PDF document text
    • http://hotsales-com.xyz/84182977019mlubr.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/tovadufizeposaxobox.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/bXPQVgg/foxnovel_app_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedixerewe.epizy.com/nadazelutufebewojazexut.pdfIn PDF document text
    • http://vapedefomagejev.epizy.com/maradona_movie_site.pdfIn PDF document text
    • http://zozusanom.epizy.com/resume_templates_editable.pdfIn PDF document text
    • http://bebidexaroz.rf.gd/siketopuvenolebogaj.pdfIn PDF document text
    • http://tilebimelexin.epizy.com/cules_son_los_signos_y_sntomas_de_la_neumona.pdfIn PDF document text
    • http://tojuributesef.epizy.com/golmaal_love_odia_song_bestwap.pdfIn PDF document text
    • http://zusesumalekuf.epizy.com/34924784370.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_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 5064 bytes
SHA-256: 3faabd9158f3c7c011bd2539e72b93c700341a338c707a93d0587fd723c78c1a
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 11000 bytes
SHA-256: 0ba3fa20eab27b62eb5ab7adbbefcbfe1c298eef457fee43dabe25fa17f3ffc2

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