Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3cb67727c97e17…

MALICIOUS

PDF

73.0 KB Created: 2021-01-08 06:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 23b7045b924b6582255286006a332f09 SHA-1: dea88c760aef7f16d9156e3d5e57cb9b068f3a28 SHA-256: de3cb67727c97e17a64461cb95b7f8145f87d74a5e657dc3211e7ac81637525a
162 Risk Score

Malware Insights

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

The PDF file contains a lure referencing a 'Missouri sales tax receipt' and embeds a URL pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest an attempt to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffking.ru/123?utm_term=missouri+sales+tax+receipt+coin+5+value In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f8f289e41ffa.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/curjcxg/car_mechanic_simulator_2018_pc_money_cheat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5fa2ef41a7a15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449392/normal_5fa179d5bb7ee.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/VZzk1M2/american_muscle_cars_drag_racing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_5fb711f5610c2.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/fevobelijogal/raspberry_pi_2_asterisk_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/cara_vlookup_excel_2010_beda_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/93219168904.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/56390769191.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/rojajariratu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac1a7e7-219c-4588-a07e-ffced438433d/24803415176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/336f25e3-802c-44c3-bb0e-1ee68e27d2eb/17758902200.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/excel_vba_format_function_date_time.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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 5184 bytes
SHA-256: 575ed844e6859f53e012d0a2cacd2d97637f2058d356d37d72a368c2c57bac8a
font_01_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 10544 bytes
SHA-256: 2ffaa6ec04b52a12abc7681fe271be17947ce57c2853579dced3998a7cbfb692

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