Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b65b3615a927940…

MALICIOUS

PDF

75.3 KB Created: 2020-11-17 15:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0d8e8b14984e706a47643c2ee55e292c SHA-1: 3bfa80864c85661a2942f492d39fb887410fb09d SHA-256: 5b65b3615a927940c457434dbb8f54d64a0f01e5f039b948c00db6c2476e34cb
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'cctraff.ru'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The embedded URL is likely part of a phishing or malware delivery chain, disguised as a worksheet.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/aws?utm_term=visualising+solid+shapes+worksheet+for+class+8 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f87b4299b26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5f9ce9998cd44.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/xuxifuzituwu/bucet_application_form_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/michelle_beatles_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/21834238210.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/manual_n_load_calculation_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/learning_pronunciation_of_english_words.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/dofofewexuxadaxadif.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/riral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417b2300-ca16-4a14-9e0d-6f66c51df3a7/12803070580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64273576-63c2-45a5-98db-ad818eb59bbb/72258678926.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/zafovidaw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 5732 bytes
SHA-256: eb9f63722db50ba3fd9ef7f56b1692d12eabd857c67ef8077ffa3b1bd11505d9
font_01_sfnt_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 10996 bytes
SHA-256: 12fb6e5aed6fe4538fd17fefbed8d41f73d8c2c070b92bef379d8123e8dda7fd
font_02_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca

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