Malicious PDF — malware analysis report

Static analysis result for SHA-256 321231f40e10aeb5…

MALICIOUS

PDF

65.1 KB Created: 2020-12-11 12:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ee1eb2442152e4dda0192f93defff683 SHA-1: ea190a42e1647002d1c193cfac08a1132b467a85 SHA-256: 321231f40e10aeb5b65c0946c8e6df43b12a20d5cda4310b37fc6cf785d828fe
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to a suspicious domain, likely intended to host a phishing or malware payload. The document body, though heavily obfuscated, contains strings related to wkhtmltopdf and a date, suggesting it might be a crafted lure.

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://trafffe.ru/strik?utm_term=typewriter+sound+effect+imovie PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/sims_4_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/cms_billing_guidelines_for_physician_assistants.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/states_of_matter_phase_diagram_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/picsart_for_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122d1c21-9f5a-4fec-9da1-ef8a740ee05a/shortcuts_to_hit_songwriting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81e3ab4-0ae7-482a-86bc-72021028b0ed/sudes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09222b3a-81bb-417b-8514-f538031f767e/17787591114.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/34378086947.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe7653bc819f1cf4abd1f9/1606317653369/89964671327.pdfIn PDF document text
    • https://s3.amazonaws.com/pukasojalu/the_fluid_mosaic_model_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/1992776318.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf69caeaf37e3b6494344a/1606379980046/kelamoduratosafaxatitoxan.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/jupegenifiru.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_off0000c3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E9 5264 bytes
SHA-256: 011df5ae1da0824a0d8fb915d6e84092e6534cc64a5121944270f0ea87519963
font_01_sfnt_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 9972 bytes
SHA-256: 4a2a8eec9591b468157ca20a51c0051b7af8716cf42542bb6eb72aa8e9c8601f

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