Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4fa5ef97754425…

MALICIOUS

PDF

95.0 KB Created: 2021-02-23 16:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6e378f5ce1f3e05149c3f910ea0c92b0 SHA-1: 33b674f539ad49b44f07cb0f853a76a0dcfaad59 SHA-256: 6b4fa5ef977544257793c3f493fccaccead6a310bf46bbd9d7a880ceb80b1c2d
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The presence of external URIs and a visual download button lure suggests an attempt to trick the user into downloading a secondary payload. The document body, though heavily obfuscated, contains references to 'Focusrite control 3.5.0 download', which may be a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/123?utm_term=focusrite+control+3.5.0+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4503033/normal_5fe1a60189026.pdfIn PDF document text
    • http://gromstroy.com/bosch_avantixx_washer_dryer_manual1zz3t.pdfIn PDF document text
    • http://vixixar.22web.org/email_template_builder_open_source.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5ffe6bd79de3a.pdfIn PDF document text
    • http://balifruit.com/nuxonowivozubufi2cgg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449004/normal_5feb5e3fee7d5.pdfIn PDF document text
    • http://beliyden.xyz/what_does_step_10_in_a_mean_urban_dictionary507lw.pdfIn PDF document text
    • http://fisutef.iblogger.org/sirekixapodevumatijoni.pdfIn PDF document text
    • http://tanifulumu.iblogger.org/pelotixosof.pdfIn PDF document text
    • http://subfamjtii.site/baverafepizujuzeminudps36n.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/jokotaziweluge/black_s_law_dictionary_2018.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/povobatiginepipusakevikuv.pdfIn PDF document text
    • http://jenesigafepi.epizy.com/ecommerce_templates_html5_free.pdfIn PDF document text
    • http://pojetol.epizy.com/38595108726.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/minopajufan.pdfIn PDF document text
    • http://moxawaten.epizy.com/24445738495.pdfIn PDF document text
    • http://kagokonutuvep.epizy.com/2418836777.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/tuvajibadix.pdfIn PDF document text
    • http://mufifofoge.epizy.com/informal_letter_format_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/volkswagen_service_center_long_island.pdfIn PDF document text
    • http://nuxavezuzoja.epizy.com/15272600411.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12050 3904 bytes
SHA-256: 37aac6ad8632b2b1f47d953b87e1a28df786d7bc80ab1c19549be903468ac051
font_01_sfnt_off00012dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFE 5440 bytes
SHA-256: 38a60933dc26a039bec2a78b6e898f8af9d960381d124cc9241944c066f4dc6d
font_02_sfnt_off000140a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A4 14708 bytes
SHA-256: aac1ace9804129e7c60c06de1dd10ffea3e4aa607651d0f951869c9e5243b97f

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