Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f66a643c243303…

MALICIOUS

PDF

77.0 KB Created: 2021-03-21 22:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 203129b9b667e5eb46877affb53dc396 SHA-1: 7a458902c9b995b7b8cf68b241c82528582a9d9b SHA-256: b6f66a643c24330371af23e90a3354c98cb70d45465e58573f78fce614a00b05
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL indicates an attempt to lure the user to a harmful site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=earthbound+scaraba+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_6023578fba0e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451756/normal_6003d1b7ad139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_603e09328067a.pdfIn PDF document text
    • https://cdn.sqhk.co/dewobube/ggjrhhe/faxivakixufafar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_600e7ce6d9bae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369626/normal_6001d4f634a3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5fc834e0e770f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_60245e8382b73.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/ciahjjg/54987580778.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/hf9gjja/women_s_fitness_at_home_workouts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_60493328b7e71.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/ghxMS15/madness_ball_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_5fe71a0eb5fea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_602f7d82c77ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486346/normal_603e4a8ebca75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488558/normal_5ffb246d6584e.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/961d55f8-eb62-4115-9aac-7e3a41eaa634/smoothie_recipes_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19b33b2-7590-4757-9665-2f7005b53954/lexus_es300h_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbac68d-141a-4b83-aada-b6e5e965e304/under_a_cruel_star_summary.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_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 5268 bytes
SHA-256: 1bdb04f0982a3d9e589b8a049e8a1f063274db642bd9596952305903ae6da57d
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 10924 bytes
SHA-256: 90d00cd7505d7eabb9b01e9948bfc0c30bb53e5295065318724a424a8a5fc6e1

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