Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8ada727877b86f…

MALICIOUS

PDF

81.2 KB Created: 2021-05-31 21:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 053c203bdf3b3949527b19a79f2c7617 SHA-1: 81a605bba3828099df6392091060fac45d8e8d84 SHA-256: 9f8ada727877b86f36904db30550cc58587b04223d44396d7be6c724e5bcc6d6
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that, while disguised as an educational resource, is likely used for malicious purposes such as phishing or downloading further payloads. No scripts were extracted, but the presence of the URL and the strong detection signals indicate a high likelihood of malicious intent.

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://seumenha.ru/123?utm_term=monomial+binomial+trinomial+polynomial+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484154/normal_60608aa4bd2fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380411/normal_5fdfeee31392a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_60150d9372937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_6056571de8551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485573/normal_603cc47081137.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_6007d4a8998cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488316/normal_5fecf53fc2bae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_601546a036c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_60183eae3c9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_6037a73ebd06d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_605ac64ad5a4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_6031c08f39ce3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472479/normal_5fcb5496ba675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459921/normal_5ffd4bbfdcc10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5fecc94c6362e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144419070/77559390916.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/xeradalimelewi.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144412635/butelafikom.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144413529/puvatiloragoziv.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_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 5684 bytes
SHA-256: 428bdd23b13d4da9b79c855e9a9474cfb279ff95ea94870b73298296b395fc45
font_01_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 11752 bytes
SHA-256: ed6ca566024f7908d901b80b95388e688bd731bca1be3cfe3446ec7f667ad94a
font_02_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 16204 bytes
SHA-256: 5f48c0e24d8aed4a0ce1ecac8d12eb7e6f158edcadbe380d4ca144b08df9a231

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