Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ff2a92b49b5915…

MALICIOUS

PDF

77.5 KB Created: 2021-03-30 13:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 40e089ed7e386d2abe4e7fde92a67192 SHA-1: 520240469a7c71416fd211d2162aa5d104ef3d0e SHA-256: 39ff2a92b49b5915d6e1f373754b2a489b0a94fc1483c5ef47b7a5dd5a633aa0
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 0.9991

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://botokaw.ru/123?utm_term=callable+bond+valuation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418556/normal_5fe6cddf60ab4.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/business_dashboard_templates_powerpoint.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444648/normal_60373d9e3f954.pdfIn PDF document text
    • http://kininorekuwif.iblogger.org/13814939214.pdfIn PDF document text
    • http://mijakaku.iblogger.org/xexaxolaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fffc2cf954fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwemanikipe.rf.gd/676558337.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_a9d48c17c6ab4329ab7b02e33a9607ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/vaferudemur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7d701a-77dc-4721-9352-e52b2fba111c/feminism_is_for_everybody_download.pdfIn PDF document text
    • http://mofikasim.epizy.com/capitals_and_currencies_of_all_countries.pdfIn PDF document text
    • http://rojazudawawuse.epizy.com/bhagavad_gita_in_english_with_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f8da34-5b77-4b69-8774-a6d560f57807/66261892901.pdfIn PDF document text
    • http://lopumupukerodu.epizy.com/monitoring_and_evaluation_tools.pdfIn PDF document text
    • http://pewusufep.epizy.com/nolivaj.pdfIn PDF document text
    • http://bofujenarabi.rf.gd/30153065348.pdfIn PDF document text
    • https://b0b8c8c5-0de0-49ea-8337-0a56b8a4e65f.filesusr.com/ugd/bf9dfc_0ee0ef2809824f7db28ec8d8c4285fc3.pdf?index=trueIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_f06776db1e074f6081357a54b4de0f07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f207c266-7946-4895-8b6d-8dc643ab1bf4/dell_inspiron_17_5000_series_2014_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/climate_change_report_november_23_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f26ee8-6732-4238-a9ff-6964637b2e7b/latest_john_grisham_books_in_order.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_905ec6363b8a483c90a346656e4ed87b.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_fab752dacf1a4a7bae421016d58b4912.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/aho_balu_video_song.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_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 4868 bytes
SHA-256: b63070ab26b882c1eaccc9349fbad5bfeb18c92126f6acf68e42f3a0759c1a34
font_01_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 12244 bytes
SHA-256: 02504e320bc6fdc91c8f41bd86bf6e8a8ba2f076c3f883c930810ecf429f875f

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