Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7779b8e34c0ee45…

MALICIOUS

PDF

81.5 KB Created: 2021-03-25 13:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8eb6f238ff865fe4d9417d1a85a26828 SHA-1: d1304a74e34dd58c2ad4693b4ac5db1c07841c38 SHA-256: e7779b8e34c0ee45c27e93cdcfdd22e064a2b95622169c585b17d312a79a4aa9
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or redirection scheme. The primary malicious URL identified is https://pelibifir.ru/123?utm_term=icmr+diabetes+guidelines+2018+pdf, which is likely used to host or redirect to malicious content. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/123?utm_term=icmr+diabetes+guidelines+2018+pdf
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/37b7f3b75.pdf
    • https://bogixeguwumuzu.weebly.com/uploads/1/3/4/5/134503630/7922798.pdf
    • https://cdn.sqhk.co/zepipawetopi/iKiimjd/excursiones_cruceros_costa_fiordos.pdf
    • http://datab.vip/jojiregege1cua.pdf
    • http://idealicaitalia.website/73765935930giak7.pdf
    • https://fulotagefopag.weebly.com/uploads/1/3/1/8/131857199/fa054a9.pdf
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/7655091.pdf
    • https://cdn.sqhk.co/zifeduwa/gdhdoRZ/qr_code_scanner_free_download_for_windows_10.pdf
    • https://fufiganegobugu.weebly.com/uploads/1/3/4/4/134496384/533eb6a819737.pdf
    • https://cdn.sqhk.co/bugabowozi/nbSiBWm/who_was_alexander_hamilton_book.pdf
    • https://cdn.sqhk.co/subogutaze/haigSgg/pudipoj.pdf
    • http://reduslim-italiaoficial.site/31098378190cn8fr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_4b6c6cb123c54cab8fdc4d4123db0431.pdf?index=true
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_8d04cb7cb271447f84458ca69055738e.pdf?index=true
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_f4a17afd7697442f8b4698a01bc665b6.pdf?index=true
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_f4449cd965d74d0b9fb189a6dd44d24c.pdf?index=true
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_cff5348fe3d04092ac5f3768ddf2b7d6.pdf?index=true
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_546e2505be564c45836543b1081af581.pdf?index=true
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_7b6d7d77d7dc485da565e6c5db05fc88.pdf?index=true
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_3e24bb77cfdb4d238629ad813fab50e3.pdf?index=true
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_9e6c5349f11a4680b9722e4e19450b57.pdf?index=true
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_9e68a03eb8114c3fb7143d753343c592.pdf?index=true
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_c667cdea220142b396238e076a5f9dc1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7f.bin
147667c70ab67e8667afe36037e302baf3d4471715917860bb09df4b90c48863		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 6072 bytes
font_01_sfnt_off00011011.bin
87e6b35525fae6eab27ba5110013f93e35ca9eb86a25edd6cbcc56be5b6fef01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 12056 bytes

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