Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb98e7d90e661c9…

MALICIOUS

PDF

76.7 KB Created: 2020-11-16 18:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bb1371fb22986a3d8173a8542ebaacd9 SHA-1: 1a2a9a235c9152cc728c0c4bb8aedf8f42080182 SHA-256: 7fb98e7d90e661c93744999ac08012b6c20979c53b00c42163ddb06f4aaea2e3
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 URI pointing to a suspicious domain, which is likely part of a phishing lure. The document body, though heavily obfuscated, appears to be related to the search term 'circulatory system diagram simple', suggesting a pretext for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=circulatory+system+diagram+simple PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451544/normal_5fac580f2f8ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5f99122d41266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5f8beef709e67.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/pesavaxedegijogutik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5f8d36fbf2f57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_5f9e7ced4fa62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f96575c6b3fd.pdfIn PDF document text
    • https://nutefowamedez.weebly.com/uploads/1/3/4/3/134330341/9140851.pdfIn PDF document text
    • https://pezujotage.weebly.com/uploads/1/3/4/3/134318684/kujomubifo-motuvikov.pdfIn PDF document text
    • https://dunofedipusafo.weebly.com/uploads/1/3/4/4/134477286/9907070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f86afe6a-c35e-4769-b93d-f42c452939e0/69561756650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2739d4d-05bc-40d0-86b4-062874240627/sfm_failed_to_lock_vertex_buffer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8448fe3-a564-4eed-be32-d5773df80460/60692573343.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_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 5296 bytes
SHA-256: feaf63942cf0b4a5624c5d55af50b706f8411b711c0d6b5e8fac4955f5532846
font_01_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 9504 bytes
SHA-256: 002620fa608b6af7b67688427e6f05eaaf829ecd5b915effd916232546290a69
font_02_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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