Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50dadbeb7c7faa7…

MALICIOUS

PDF

75.2 KB Created: 2020-12-22 15:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bc491d3206b7737d5adb6ec5c9a56d82 SHA-1: 38f7d8bcf8430368efc8a81bf354b75e29b4731c SHA-256: c50dadbeb7c7faa765817826b6fb7301e31a56426a28674bf736c70fb5941d53
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, specifically disguised as information related to 'Gaston county schools covid'. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL is the primary indicator of compromise, likely leading to a phishing or malware download site.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffine.ru/123?utm_term=gaston+county+schools+covid In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8f22c220720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fce6b15080c3.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/tunenijexe/86976336801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96ba98a-5c6d-418b-a623-fb77b52f51f4/mijiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/84934425528.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/super_lube_synthetic_grease_msds_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0629b90-23a6-4741-bab9-906268d2dfb0/2010_toyota_rav4_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/adobe_reader_xi_offline_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/22862919822.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/84874083837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02215488-f28b-494e-a4e9-aafd7541c79c/90803252467.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/psoriasis_guidelines_2017.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcff4ac7afe470b556d2be/1606221643336/xurejevurajad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7f34c1-2c34-4cac-b29a-eabd6520339c/devops_engineer_resume_samples.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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 5124 bytes
SHA-256: 96a543c8abc0a50f2612a7a1db996b4b1ad9b95e6ec27a77da0d23b82557138e
font_01_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 10608 bytes
SHA-256: 1f06b89ac00916409979ba1d142f1e77a0cd3af02e47ad94452d94ad96a6c776

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