Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caa03398b820c18…

MALICIOUS

PDF

80.9 KB Created: 2021-02-25 19:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dbfee185d84305f132a0b39ec6e942a3 SHA-1: 38afc3a46f30f0004e79dcf875fa889813f06f98 SHA-256: 6caa03398b820c1837938fab20941d9d12d2539ece7eecbefb4d6364e1a8192f
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'jacksth.ru', which is highly suspicious given the 'malicious' verdict and ClamAV detection. The document body, though heavily obfuscated, contains references to 'flute etudes' and 'wkhtmltopdf', suggesting a lure to a potentially malicious website. The presence of multiple external URLs further supports a phishing or malware distribution attempt.

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
  • 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://jacksth.ru/123?utm_term=flute+etudes+imslp PDF link annotation
    • https://cdn.sqhk.co/bedepekemat/xpmDhbn/dorudukubatatufiselorisav.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/la_la_land_free_movie_online.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/circular_and_satellite_motion_worksheet_answers.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/gagetopurefepulo.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/Fhcchbe/exoplanets_definition_physics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_5fd26606d3fe4.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojonujaj/eVgecKv/real_racing_3_hack_2019.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/macbeth_movie_script.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/wenobagupexekap/nilupunogu.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/42814549146.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/82827506642.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/64362697684.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/163899054.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/houghton_mifflin_math_expressions_grade_1_worksheets.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/65798092907.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/2012_honda_civic_si_repair_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 4752 bytes
SHA-256: ab07f3762b32ec89d0f66e1cfc26646d60a3ade343be862a2fa143cfc989684a
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 13224 bytes
SHA-256: a153b8156d80a131d4726d0996d04023cc810eea8a013925d09141ab0d1c4fab
font_02_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca

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