Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5363d464ef9f768…

MALICIOUS

PDF

86.3 KB Created: 2021-03-24 01:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1f372384ffb273010e348fe2dd65f50 SHA-1: 00d83a92312e365448cc536a628a436d41d46b34 SHA-256: e5363d464ef9f768bfecd544bc5e58ff1db61206f5531c2fa364cd58cd6e9ec1
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded URLs, one of which is presented as a worksheet answer key, suggesting a phishing or malware delivery attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=formulas+nomenclature+worksheet+answers
    • http://rotiwopofeze.mywebcommunity.org/luther_95_theses.pdf
    • https://cdn.sqhk.co/fejumoraw/dhigdih/pesulil.pdf
    • http://trening-ekaterinodar.ru/rose_symbolism_dr_heideggers_experiment3p7ca.pdf
    • http://inter-kalinka.ru/bikuxaript18yi.pdf
    • http://wiinorama.space/angry_ip_scanner_apkpure9qibf.pdf
    • https://static.s123-cdn-static.com/uploads/4448558/normal_5fe108c72fb37.pdf
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5fe250022e74b.pdf
    • http://itrom.fun/why_is_my_acer_chromebook_keyboard_not_working6dqmm.pdf
    • http://siwivelijutore.medianewsonline.com/84045861733.pdf
    • http://vuzetasavuxoso.mygamesonline.org/59378760238.pdf
    • https://cdn-cms.f-static.net/uploads/4492294/normal_6023b37732c9f.pdf
    • https://static.s123-cdn-static.com/uploads/4484126/normal_6003af1890898.pdf
    • https://cdn.sqhk.co/zugivakizo/8DhibDP/nazisajararepenubexisuvi.pdf
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdf
    • https://cdn.sqhk.co/befozaxulot/heUJSSX/tiny_whoop_racer.pdf
    • https://cdn.sqhk.co/lagusive/njinsjf/prison_escape_room_s_secret_14_walkthrough.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6cd7a2e-7289-490d-bb1e-dc5efc9a89b9/hp_deskjet_6540_printer_cartridges.pdf
    • https://uploads.strikinglycdn.com/files/7a0e9e1e-7902-408b-9e2f-ffaa8b819614/11168017255.pdf
    • https://uploads.strikinglycdn.com/files/4d380680-cbec-4101-91de-14536649b100/blankets_craig_thompson.pdf
    • http://titugol.atwebpages.com/koxakepuraxuvazunax.pdf
    • https://uploads.strikinglycdn.com/files/c6071882-5378-47d8-a268-9163f45fd296/can_honda_generators_run_on_natural_gas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd8.bin
1ec67f4dd01bf2edaed9e14c4846ea73af066fa824c40e5cfb7bb83c6a1f96fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 5148 bytes
font_01_sfnt_off0001113f.bin
467dc221c07e7eb0a89d9161b8e8cea8fbdfc80cdcabedbec907b9242d3eaf3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 10848 bytes
font_02_sfnt_off00013647.bin
503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13647 16060 bytes

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