Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d984e0629babff7…

MALICIOUS

PDF

73.1 KB Created: 2021-09-30 12:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a86223af4063ad3b248e5f1c8c47a722 SHA-1: f2f544f7cbb4854b48d03933c63ea434748a1d8b SHA-256: 3d984e0629babff7a7d74e946fbd9a43c93e6c736b7eb49eaf8d5d4c08327963
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to disposable hosting, suggesting it is used to distribute phishing content or further malware. The presence of external URIs and the link farm heuristic strongly suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://allytemp.ru/uplcv?utm_term=it+happened+in+calcutta+full+episode+download
    • http://kvarkeno56.ru/userfiles/file/fipupolavolojotisepusama.pdf
    • https://scalping.ir/data/files/file/30773778317.pdf
    • http://marktoby.com/akram/know_news/admin/userfiles/file/jusasuzemabizumo.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910124856664853.pdf
    • https://danielstrehlau.com/userfiles/file/beranimexo.pdf
    • https://turkeyinsurance.info/images/file/76235532772.pdf
    • https://taperagi.com/contents/files/66097806931.pdf
    • https://endeligmandag.no/e-brev/data/div/94673953117.pdf
    • https://alkathirilaw.com/userfiles/files/venolejonarevokev.pdf
    • http://nwatchonline.com/userfiles/file/20675983589.pdf
    • http://thanhcongtechtra.com/upload/files/wowiv.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f8e6435f8---wawidemutivewozaxu.pdf
    • http://vipnovini.bg/root/f/uploads/files/najetimitalub.pdf
    • http://stickerbarcode.com/file_media/file_image/file/96670731272.pdf
    • https://www.lipca.com/ckfinder/userfiles/files/57754854084.pdf
    • http://vladjurnalist.ru/archive/file/25070759812.pdf
    • http://pluimveebeurs.com/userfiles/file/63226998154.pdf
    • http://rabotatver.ru/userfiles/admin/20986632742.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/23743128498.pdf
    • http://hfnhsw.com/upload/files/63431169974.pdf
    • https://hockeymro.ca/docs/file/32433446295.pdf
    • http://ttworld.hu/uploads/content_files/files/losibufemibivize.pdf
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/78525077600.pdf
    • http://adimhukuk.com/resimler/files/niretebagebatumatugete.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf1451912---pobunudiledogorokazelode.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5b5.bin
146fef16f3d2d4db4fcea2b439b936e7894b74f0d8cafda531235e083856d590		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B5 10756 bytes
font_01_sfnt_off0000ce75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 16792 bytes
font_02_sfnt_off0000e687.bin
306d79116ed576a903f7859e3a210450e0dde9ca2a17ad95c90918cbe97df1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 17804 bytes

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