Malicious PDF — malware analysis report

Static analysis result for SHA-256 907490b29ccd9b33…

MALICIOUS

PDF

76.7 KB Created: 2021-05-22 07:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f9be4e3f35744e953c7ecddbd7cc5feb SHA-1: c5a23618c691d97c35eb7f8b77c6ffe474ff730d SHA-256: 907490b29ccd9b33b69529db7e50209deab4f7670ec3a60d42e5fd5b6cdd2fa9
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=descargar+minecraft+pe+android+sin+licencia'. This URL is presented in a context that appears to be a lure for downloading a game, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/strik?utm_term=descargar+minecraft+pe+android+sin+licencia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501041/normal_601b57769007d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469370/normal_5fef51b77a9dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_60198eb259cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501198/normal_604d2030546d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_604b678c1aa9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422894/normal_5ff0b57a8a581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481847/normal_6055ac4dba2c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_60651ce249044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496001/normal_602ac5ddeee8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26879149-7279-4b09-b609-a97edf7fc70c/us_history_chapter_7_section_2_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/honda_es6500_generator_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb13a46-72f8-4ce5-8439-cd2ff4249003/iso_image_windows_7_32_bit_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f9b8f7-f260-47eb-b384-b913275f25d9/dalozokudemoxunimafewole.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/bise_lahore_10_class_2019_date_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347e603c-2285-43de-a64b-d71db7e5a26d/43046448691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d77098c-23fe-45a7-91e5-9534f0562676/vukivev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16021739-2661-4481-95eb-53d943b6a63d/database_admin_salary_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/realtek_audio_driver_windows_7_64_bit_dell.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/15080473851.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/4572182182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44caf0e-a531-4f3f-9ebb-8681abe0118b/inflectional_affixes_list.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/what_are_the_weaknesses_of_transformational_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b3efd8-2331-486e-ba7a-57dd820fc9b2/xufefex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce4ab00-0a61-4910-8624-d88273a605b9/hundreds_chart_printable.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_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 5476 bytes
SHA-256: 256baf0a3e4a29531908bae8ac450d06b0545f1b6ab963a29190b9eee1980892
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 11108 bytes
SHA-256: d2ba5fb03f2493d4ca5b3accb5e1f81a27bfd71d7b24c7fedc38a6a8c5defd20

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