Malicious PDF — malware analysis report

Static analysis result for SHA-256 4779c8c7509892f3…

MALICIOUS

PDF

76.5 KB Created: 2021-03-11 14:20:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 066d4a7a51577d3ff8dcbbae00557cfa SHA-1: c0c466484e715a41a2c032e2d31bb463f652ff5a SHA-256: 4779c8c7509892f3bf9d675abebb542015ed1b6f6747b58f498912d4958d77cc
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=cuentos+reunidos+amparo+d%25C3%25A1vila+pdf PDF link annotation
    • https://cdn.sqhk.co/kurutuxerodi/idkgjDB/23559734688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492286/normal_601d5015729ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_601a1dd84a313.pdfIn PDF document text
    • http://negozio50sconto.info/22439101440rioen.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/dMjdgcK/my_pcc_portal.pdfIn PDF document text
    • http://daating19.site/block_strike_pc_20207ugkc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_601fcb6782b77.pdfIn PDF document text
    • http://esmoney.site/figure_drawing_classes_near_mer8ky8.pdfIn PDF document text
    • http://alexandreablog.com/68437478824mcv2x.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/fHcyjbv/sufirufusetuserilabol.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/gl5p2gj/malip.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/Zgc7nE9/jitikiselo.pdfIn PDF document text
    • http://pedron.fun/how_to_study_for_civil_engineeringtc56v.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/hSgcgd7/sleep_sounds_rain_and_thunder_website.pdfIn PDF document text
    • http://snatural.space/40198558723ion7f.pdfIn PDF document text
    • http://webdefilmizle.com/capita_linguist_timesheeteshr0.pdfIn PDF document text
    • http://4escam-bot.online/vafosulowumutetokupazepu62xzc.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/ee5ifgj/dual_monitor_desktop_computer_bundle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60454f1fb8a13.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/medaliwifufugel/12848944493.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/google_digital_garage_final_exam_answers_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/ion_usb_turntable_ttusb05.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/70754288679.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/1883528198.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_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 5384 bytes
SHA-256: 91436ae2db6cc8dacda83b7975b7382865ee12a2ba2cf2405f4d3511b419a9fd
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 11404 bytes
SHA-256: 9397ce01c6f157526032eef881dbb7c18e2494e81109c7ff8dc6bf379782a125

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