Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c10cced77c6423e…

MALICIOUS

PDF

77.8 KB Created: 2021-03-27 15:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3d04e027da5458f79c191291169073e8 SHA-1: b18a23c1072173fa50ef7e86e051abc8a0b83348 SHA-256: 4c10cced77c6423ee5cf038383aca4d3b0d5ff8bb81b1f7a3657d246d43b76e1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/strik?utm_term=partituras+de+piano+principiantes+pdf PDF link annotation
    • http://sopesukenapad.scienceontheweb.net/whirlpool_edr1rxd1_refrigerator_water_filter_filter1_3-pack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_604a6905290c3.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/iigpiiX/rocky_mountain_national_park_climbing_guide_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_602a888821c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_600c1a5f38ae8.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/kHqiahj/tunnel_of_trees_color_status.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jigfij8/fruit_heroes_legend_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382961/normal_60016c667d25d.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/dhjhijh/25764547119.pdfIn PDF document text
    • https://cdn.sqhk.co/fubebevukad/ihgEhdh/el_alquimista_paulo_coelho_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fd629981dae5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baletax.onlinewebshop.net/silabus_biologi_sma_kelas_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bb6b46-df03-49f8-8a7f-e4c8c0b78e7d/67604386233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2feb2b9-a588-4454-92c5-a8668b5130ee/17276520094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aacd688-7429-47bf-9881-8f20ddaff564/siwixekukizofabuvobude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e166f1-1071-42ce-ae22-bc126242f740/can_doctors_do_home_visits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a108098-6482-48c1-837d-c8205ab2e0f1/zixesuxofekipisegofutam.pdfIn PDF document text
    • http://dijuvunote.onlinewebshop.net/exercicios_de_atomistica_filetype.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa8dc0e-14f9-4450-ad1d-d61814df662b/66163704521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e38c4a-2af5-46d3-afd6-984562eb165e/information_technology_engineering_salary_in_india_per_month.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/rowizejanud.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_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 5116 bytes
SHA-256: d9c3cf9142eabea48e321a111a7260d320818039e70d8d96386767bdefb3bcae
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 12072 bytes
SHA-256: 96229a645efc5f5cb42db07b81603893eb4dfc4df7f9cf399eb3fb7ba5fd9366

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