Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65eeb364ab583d2…

MALICIOUS

PDF

67.0 KB Created: 2020-12-05 13:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9013c9093510f9d4fa91e2ced05fa9d1 SHA-1: 8394d9e0dc6e9afbaf4cdf43b2f776e106f0a5e4 SHA-256: a65eeb364ab583d29b09f8714ab545cd606a7547dfdeadd8cb13225cade8d79d
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, directing users to external sites. One of these links, 'https://traffmen.ru/strik?utm_term=politics+of+piety+google+books', is flagged as a malicious redirector. Another link points to 'https://zatitudebijozi.weebly.com/uploads/1/3/4/4/134460539/muveso.pdf', which is part of the link farm. The presence of these malicious and redirector links, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffmen.ru/strik?utm_term=politics+of+piety+google+books In PDF document text
    • https://zatitudebijozi.weebly.com/uploads/1/3/4/4/134460539/muveso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458635/normal_5fbe2c210a7da.pdfIn PDF document text
    • https://bulireta.weebly.com/uploads/1/3/4/7/134727307/luzuso.pdfIn PDF document text
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/6455814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf493cf3de5e49b55a4fd0/1606371645083/cardinal_choice_insurance_plan_2.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/quick_heal_antivirus_crack_version.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3ac41972c46e3c6a6f1e/1606302405336/how_to_construct_a_frequency_distribution_using_5_classes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66f087848ba205d3ecad5/t/5fc985d7fedaa13a485935fb/1607042521490/fefelen.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1175aa879396864096daa/t/5fc12322cb3e0f5771782757/1606492963116/18393281432.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/47367282728.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/sawum.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5a71f81c9a2a0c9956b7/1606376051244/types_of_slopes_worksheet_answer_key.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_off0000cbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCD 5184 bytes
SHA-256: 2e16d854b0ad2a507fbe520a3891d91db328efb0411e171651f82f38ebe3980d
font_01_sfnt_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 9928 bytes
SHA-256: 347852231affe3682868bcb89a4efba34da458b56ee41d99631d796ae7bc424c

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