Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dda086b47697884…

MALICIOUS

PDF

74.3 KB Created: 2020-12-25 01:34:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 512e483c9029ca6bb6a16a55621e2042 SHA-1: e791eb83df23416d028c890b01bc0087305d7c61 SHA-256: 5dda086b47697884b8c93cd18f0d20a27590e2b754cf291526429c3a75839aca
154 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 'traffine.ru'. This URL is likely used to redirect the user to a malicious site for further exploitation or phishing. The ML classifier also strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a document.

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
  • 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/aws?utm_term=duplicate+values+in+excel+between+two+sheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5fd68bd1c83f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_5fbec7ce27b29.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/hcmcbhc/living_a_boy_s_adventure_tale_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/hingegX/catchmaster_insect_trap_and_monitor_sds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451363/normal_5fce917e2f733.pdfIn PDF document text
    • https://cdn.sqhk.co/bumigorawi/XPjbOwZ/mufexasesidu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5fdecd5e64680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f9b5cbe67a3f.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/mokamoba/article_35a_of_indian_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3e3dd5-e264-4f10-b919-44f5485882a8/51375913511.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/75463805053.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/us_history_textbook_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/video_editor_free_for_windows_10.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_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 5284 bytes
SHA-256: a265b99b697f3e6a902824326809d8d786d916c5451808b7328e92423395ec5c
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 11220 bytes
SHA-256: d798b523352f0212b1259adc90cc0421947c11ce5d8ba7c2a62a631de549ce37

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