Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e3b5bd6d8d6102…

MALICIOUS

PDF

84.6 KB Created: 2020-12-06 09:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef08ac6abea405f98d72bfbbe892810e SHA-1: c2033a25240e50ec6ac7ed40a06aedd3e227e683 SHA-256: a4e3b5bd6d8d610272690efd2f690f7d7e822d719fd9f1dffdfb550b97b3fbec
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised as a search result for a product manual. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded link suggest a phishing or redirection attempt.

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://ggtraff.ru/123?utm_term=conair+steamer+manual+gs23 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5fa970e03cc59.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/regufojalojaza/brastemp_ative_manual_refrigerador.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e155104edf1d7780ac3e/t/5fc2f9b87acac6192a22e94e/1606613433168/37965790876.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/pavuxowitiwuroralekilox.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2c57848ba205d187778/t/5fc7dc8a68a3ad1e41200240/1606933643240/ulster_u20_football_championship_2020_results.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2d64d9-94b1-44cf-85e4-baf93e2388e9/the_cartoon_history_of_the_universe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a552c3-e1ee-4662-ad47-c9e7adf1e40e/woruwabezirikubegekas.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c817d49dd124474d2720/t/5fc7e99a2669d559a486b7ab/1606936987614/fimobuworomijakamol.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79b152da0933358952f14/t/5fcac448206205589feed57f/1607124040746/can_you_answer_spam_calls.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd15dd5dd8cf232ed1559f/1606227422382/the_fractal_continuum_hard_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/raisin_in_the_sun_poem.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc007c924b06a7eb3fa3bc3/t/5fc1d9de3c02f22b9d5106a6/1606539742454/group_natural_numbers_under_division_true_or_false.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f88bd26ff1194f740ef3/t/5fc3f1a4eaf37e3b641626e8/1606676901702/ruger_vaquero_grips_bone.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_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 5204 bytes
SHA-256: af0a92e67a4a6d83d9d0dca942e20dacf921c4919de119eb50d41b3e222ae60f
font_01_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 11564 bytes
SHA-256: d47491fad9aaa9a28f4e9192e80e694608fdd2f384b10df0653f33fed152e678

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