Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0f396698558613…

MALICIOUS

PDF

75.8 KB Created: 2021-02-12 02:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b33a69cd9e2eb6913a1cf3a6ab9c87eb SHA-1: 13ab28b566ad98465d5b417a6fd1c9113075f6b3 SHA-256: 9a0f396698558613eb6c0dafde8a2817cf1b0696b96b69e0646078a5a857daaa
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body is heavily obfuscated but contains references to 'wkhtmltopdf', suggesting it may be a generated document. The presence of external URIs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=andrew+king+indianapolis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443823/normal_5fdc882ab7d75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5ff3fd2aa1090.pdfIn PDF document text
    • http://moresukko.ru/depasimub1gja.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/jNgdhdC/lowes_refrigerators_lg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_60127fdb54706.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/mexijegedakol/damelapojatolalizupap.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/berserk_2017_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/43444094262.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/printable_5_column_ledger_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/application_of_gis_in_watershed_management.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/domain_driven_design.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_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 5272 bytes
SHA-256: 6c4cd1cfbb60b8c9f8553b183d3e75ac1ce9c4beed73c9f41085f49f62426fad
font_01_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 10496 bytes
SHA-256: 076d46bc6bdd2ab937b5c154de33a928f07a458a48f6c88cb4e0b2e6558be9db

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