Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2983b334e12d9c…

MALICIOUS

PDF

81.9 KB Created: 2021-05-02 17:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9f12fc00803a89c92d6d3279ffcfd9a2 SHA-1: 2edd5b5720b18c3abbe27edc4479d1dbf9493024 SHA-256: 2f2983b334e12d9cab3e46c0aa610ac830f203ded32a15a53d4e3c92c173573b
186 Risk Score

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 0.9998

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://xezojetit.ru/strik?utm_term=comcast+dvr+not+recording+in+hd PDF link annotation
    • https://cdn.sqhk.co/temududote/bWBghaV/kuvir.pdfIn PDF document text
    • http://parhelifrl.space/bizaxexaginovjsx55.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/jghigja/deadpool_hd_wallpaper_download.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/self_assessment_tool_for_teachers_deped.pdfIn PDF document text
    • https://cdn.sqhk.co/rovukupovumo/njgjeHZ/88166944538.pdfIn PDF document text
    • http://mrshadow.net/the_trials_of_apollo_1_summaryryd4i.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/anatomia_de_cabeza_y_cuello_para_odontologos_gratise3a0s.pdfIn PDF document text
    • http://urro-hu.com/delete_watermark_online_freeulw7g.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/migunajaloturetirax.pdfIn PDF document text
    • http://item-mask.top/lodokebalomepibapugosopugn28vb.pdfIn PDF document text
    • http://perevod24-card2card.site/advertising_creative_strategy_copy_and_design_4th_edition7p25a.pdfIn PDF document text
    • http://pisufixefonof.scienceontheweb.net/breast_cancer_project.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/32180831120.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/3gczYQl/39287954912.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/kanujoziva_kafagizuwiti_dapozoru.pdfIn PDF document text
    • http://xevijuwidenuxet.mypressonline.com/lesabijujigolepusebo.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/jgegi8c/hp_wifi_drivers_download_for_windows_8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jimugivos/20584409332.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/xisojomu.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_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 5288 bytes
SHA-256: 9e8fef49c5ace7fc78604bd28f611dc4986a598a94430f2f164ed446deecdf8d
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 11088 bytes
SHA-256: 601fbb7fc111caa70b9f6f12399278bc45d6399753af2193e5753c5a7099e7a7

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