Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf0a7d4e4f73980…

MALICIOUS

PDF

75.0 KB Created: 2021-03-26 15:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 872e3ccac7882474e7dfe223139b620a SHA-1: 3b9a8f91dd28ceb43b401c407153374889527520 SHA-256: edf0a7d4e4f73980fdc97899b4c110a62df6a275d814d2ecd6a5ca7e4e9cea2b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=1+to+100+in+spanish+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420917/normal_605ad5b6a8ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_6031bb54792dd.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/GjcbuDa/pizodiremujadokame.pdfIn PDF document text
    • http://stassikorskyi.com/devutupinemet015r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_600a797ea02ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425483/normal_602ac4ce50a68.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/ciigegg/equalizer_2_producer.pdfIn PDF document text
    • http://werenntaq.online/942715711063xo5k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_6040ea9ef14e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464877/normal_5fe38db167cea.pdfIn PDF document text
    • http://kinokaiff.space/cheat_sheet_sqlalchemy82yua.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/27760e5f-e1ce-4225-9602-e71f85c0d2c7/small_business_management_an_entrepreneurs_guidebook_7th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c346e17-8200-4121-9993-0cd3658bf788/zemowated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a276f1af-a785-49f0-bd00-493afb0d2458/does_rafael_speak_spanish_in_jane_the_virgin.pdfIn PDF document text
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_f2e8b79d5af54caaa3d09be8f62a56a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/759da70f-9750-4973-97da-ff93d7fe1113/39766709405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b522c9-fd10-4646-910e-c3d3ae2ee496/seagate_freeagent_goflex_home_factory_reset.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_c4db3e4b7228449a9aae39821a3d1aa4.pdf?index=trueIn 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_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 5120 bytes
SHA-256: 4c365aa627927f9111c7acc5527c045fa2d635810396a38f805282c8ec60ba5a
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 11228 bytes
SHA-256: 70f1c239c570f301d438b3367098aee37bd7d68b270a054cc6045dca5adcfc89

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