Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c194fb3a6c8c8e…

MALICIOUS

PDF

78.6 KB Created: 2021-03-07 05:36:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c3616cafac90b72345d9f55bb4c3f879 SHA-1: 823d2fb2b1ef586f07713bde2de9a7a8ff193dae SHA-256: d3c194fb3a6c8c8e9c1c22b86f8d5e460212cf6fd3d9c81c2951021418aaa83a
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 0.9998

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://resalured.ru/aws?utm_term=coleman+inflatable+spa+replacement+pump PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487208/normal_6039c4d6cb90e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493221/normal_5fcff458cfffc.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/bibaxufenolisuvod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fe1a80c42627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382972/normal_6003cf73b4ad1.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/best_free_2d_animation_software_for_windows_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448110/normal_5ffc0e1854d20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_60443ddee105c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_602e6f018c427.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/what_did_the_2nd_estate_want.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanomunem.epizy.com/most_irritating_alarm_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/renofifekojin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83935b1c-b422-4a7c-8d7f-0ef9e77f32e2/xeruweso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60517eb3-1764-4f63-b9e1-4b548a543883/historia_natural_de_la_enfermedad_diabetes_tipo_2.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/dovibatepelame.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/disney_cars_sheet_cake_ideas.pdfIn PDF document text
    • http://kategemum.rf.gd/tecnologia_assistiva_para_deficientes_visuais.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/20252063964.pdfIn PDF document text
    • http://segigeserife.epizy.com/nexaxazurowe.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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 5208 bytes
SHA-256: d162ca51674b253bb3fcdf7e0ecb09d72f7c84316adf58bec3a2e9c85a86f595
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 14632 bytes
SHA-256: fdbf41639cfc45157143ed5d6b44369798eaca59f527a081fe856af24c8b5e39

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