Malicious PDF — malware analysis report

Static analysis result for SHA-256 1876cbef36cc3c59…

MALICIOUS

PDF

67.2 KB Created: 2020-12-17 21:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 58e3ea5653350b214a3bd65d0a9a8b7f SHA-1: eb5a1252ff44533df2701df824cde6d0925a070f SHA-256: 1876cbef36cc3c598ffa3a8be8c7b03bcee5dd9b03e8725b178bb520a58f5e98
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 'https://traffking.ru/strik?utm_term=tiredness+and+fatigue+after+stroke'. This URL is the primary indicator of malicious intent, suggesting the document is designed to lure users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment.

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://traffking.ru/strik?utm_term=tiredness+and+fatigue+after+stroke In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5f9101f466e31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f89f219b6443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5f9b8c604489a.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/paxuvagal/zasopazixesub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90b49b1-0981-4b58-9931-74580b98720a/popum.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/dinokejaxagubawirirudival.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13070e2fce462bc8dc846/t/5fd004d93e94b40d0389f865/1607468250433/ralamume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2de71b1-0341-4b06-8e6d-a8ce8e168f9a/astm_a153.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/dark_incursion_apk_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/in_text_citation_apa_report_no_author.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/formation_of_carbene_from_chloroform.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/large_format_camera_images.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/tipos_de_lenguajes_documentales.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_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 5056 bytes
SHA-256: 77e3a902d5192aa61f8e4587bda15d9214b62ddc6dbdcbeccbc86b0269e105d0
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 10396 bytes
SHA-256: 93079a69c37918694b94eb9d13bc49ff033f80574259ac64af0319d8d2aecf9e

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