Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb0d51e897b5978…

MALICIOUS

PDF

67.4 KB Created: 2020-12-23 18:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5722cf1f3c215885e92a03d84966db58 SHA-1: 445d2354e2d09b0cd06436c1e1fd508222674d89 SHA-256: ddb0d51e897b5978b804cd41980adbec0cf198b5e4999c3520892dd341ed658b
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a URL that is likely a phishing lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs within a PDF, coupled with high detection scores, suggests an attempt to trick the user into downloading a malicious payload, likely via a link that would execute JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/wb?keyword=megatube%20for%20youtube%20player/%20downloader PDF link annotation
    • https://cdn.sqhk.co/kewexezaviz/ijeiiDj/archery_master_3d_download_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476126/normal_5fcd71c47046d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fab29dc4b2ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fe27cf803625.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/ZxgcjiK/big_ideas_math_blue_answers_10._7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fa5353d7a241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_5fdc3736745d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f9b3e1cabb82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_5fa4145a38a8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df7df30-295a-4a08-b76c-028e966fdf17/61866698100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45705d60-5418-4a80-a459-880852536fac/63051997057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2849412-83ab-4e64-bb2a-7a9671f0841b/libro_de_matematicas_de_1_de_secundaria_editorial_castillo_contestado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d1e8e4-6e54-4441-850e-944314378004/chapter_6_lesson_1_answer_key_social_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f1f5d8-1e1f-485f-86cb-72c3d42a0b49/97649849560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ba3966-7561-43ad-853c-a28b2340c843/google_sheets_sum_entire_column.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_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 5404 bytes
SHA-256: f41acf1e37dcff97031683f56b91a413cf46ecd0eb8c1d94cfa7cf871c919c2d
font_01_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 11264 bytes
SHA-256: cbef33be89c9d1db0fe6921445854e957046637d6b19548cfc58fc6fe7cd8a98

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