Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dfa8587df0b840…

MALICIOUS

PDF

75.5 KB Created: 2021-03-12 20:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c85e2bf2a93e59624dccbce7646c9009 SHA-1: 2e0bd8ed6bee99ec11d4a01c587d05596713bd47 SHA-256: 27dfa8587df0b84068954d7ad570467e3699dac13be64128b2e0bbd731317e92
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable or unknown-reputation domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wb?keyword=amor%20en%20el%20tiempo%20de%20colera%20frases PDF link annotation
    • http://zutelotojenexop.getenjoyment.net/my_water_heater_pilot_light_keeps_turning_off.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495257/normal_60286336a165b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_601d16816071d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457330/normal_5fc9cc99a9f8e.pdfIn PDF document text
    • http://rapejavom.22web.org/26831464532.pdfIn PDF document text
    • https://cdn.sqhk.co/vapitinab/enCEgd6/mebini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_604a3aadc0307.pdfIn PDF document text
    • http://fusojosejivo.iblogger.org/cooler_master_storm_trooper_window_side_panel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5fc7da738808d.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/fiwonatubomamemiramo.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/9vhj6jh/infected_cuticle_treatment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_defd8e72c9f74c7f85bbac1528dd1a1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamibis/puvupipejodojegalaropupux.pdfIn PDF document text
    • http://kabewusibun.epizy.com/guidelines_for_effective_delegation_of_authority.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_f8d50e43e27c44d9946f484b85051aae.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_51068bc098924ac086cc981ce84242af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/99769000613.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_929777eae9564076ba3ece84c462d66a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/migazivenitepela.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/bella_ciao_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/bonafide_certificate_format_for_passport.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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 5288 bytes
SHA-256: 5170be681bc4dc1f811af03d6306e60aa7c2bd52fdf7f6706d4dbfbc73d27480
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 11288 bytes
SHA-256: 1ac5ad5b3a5bf9e269f3adc0a787a4ce9eebcb04ce73060c62209703f2bd62d7

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