Malicious PDF — malware analysis report

Static analysis result for SHA-256 9066260892080b21…

MALICIOUS

PDF

75.3 KB Created: 2021-06-12 19:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3f445a7fc94ebb1a159b2805d2885abd SHA-1: 594b7785810bdfc319f4f149f1cb4a61c3c178fe SHA-256: 9066260892080b21e607e239a0a725b759fe8493746279199b43949ecb38558f
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 high ML score and ClamAV detection, indicating malicious intent. The document contains numerous links, many pointing to disposable domains, suggesting a link farm designed to distribute potentially unwanted software or lead to phishing sites. The primary malicious URL identified is https://inwebjor.ru/pbw?utm_term=turbo+vpn+lite+premium+mod+apk+download, which is likely used to deliver a payload or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://inwebjor.ru/pbw?utm_term=turbo+vpn+lite+premium+mod+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459477/normal_60199d14f41f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_60bffc7c1a0ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_60346306c07fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bafakud.pbworks.com/w/file/fetch/145158072/papas_taco_mia_to_go_free_download.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/f/skyrim_xbox_mod_load_order.pdfIn PDF document text
    • http://kejuziz.pbworks.com/f/aos_tv_app_download_for_pc.pdfIn PDF document text
    • http://kevukimugo.pbworks.com/w/file/fetch/145194873/element_8_periodic_table.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144624678/problemas_resueltos_de_maximo_comun_divisor_y_minimo_comun_multiplo.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144982560/60726480434.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/f/kilazalanapunuzovo.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/buvudotu.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/w/file/fetch/144541119/omron_blood_pressure_log_sheet.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/when_does_season_4_of_miraculous_ladybug_come_out.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144760233/claves_de_activacion_de_office_365.pdfIn PDF document text
    • http://vowetegaperi.pbworks.com/w/file/fetch/144893262/blackmart_alpha_apk_download_latest_version.pdfIn PDF document text
    • http://kevububorile.pbworks.com/w/file/fetch/145029240/spivak_4th_edition.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144717534/libros_de_electromecnica_de_vehculos_grado_medio.pdfIn PDF document text
    • http://gufabewa.pbworks.com/f/waberunaruwezobaranipaw.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144547275/24235811432.pdfIn PDF document text
    • http://difusowafid.pbworks.com/w/file/fetch/144963402/xev_bellringer_virtual.pdfIn PDF document text
    • http://sikovifif.pbworks.com/f/79697557710.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144506559/quantitative_and_analytical_reasoning_mcqs.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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 5232 bytes
SHA-256: d7fe45133b9b8e9dede6c60e858dc18b0c5cf8dadf11f5259ccce3f43384a05b
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 10788 bytes
SHA-256: 41a8a7ec33ed5272ffb9be6d0c82c2b4f5da84a2a1a071d522c1acb79656f80d