Malicious PDF — malware analysis report

Static analysis result for SHA-256 d403c96fa58638b9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 00:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a4ae01c77afbbecd06c2f53c8038652 SHA-1: 6d269e555f120057b2d083dc687107637e6bb0f5 SHA-256: d403c96fa58638b9032bb4e7fb771a9eafaeb48790ca8ae0faa22f223e60ed4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. The PDF contains numerous embedded URLs, many of which point to PDF files on potentially disposable hosting, indicating a link farm designed to distribute malware. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48aceded0---22985976969.pdf
    • http://haphadoor.com/upload/files/kajufawugufamo.pdf
    • http://icr34.fr/icr/icr34.fr/www/files/files/nelofexebivojanavoli.pdf
    • https://wangwangcamp.com/uploads/files/202109082153288067.pdf
    • http://pjzhengwang.com/upload/file/20210914_171851_154.pdf
    • http://sarljarry.fr/userfiles/file/27950919121.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/jibulunozodevubuvugep.pdf
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/31564265900.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/lelimukaka.pdf
    • http://nfrostov.ru/upload/files/nadasatunegavarezetinimis.pdf
    • http://casavacanzesanvito.eu/userfiles/files/36082967500.pdf
    • http://nscenter.cn/upload/files/firutotilekilewi.pdf
    • https://ichibaninfotech.com/ckfinder/userfiles/files/dapotodubinobo.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/sewasox.pdf
    • https://ratosatu.com/contents/files/dagafitavonerukasiw.pdf
    • http://custom-mugs-factory.com/uploadfile/files/sejirokufigenunowazabasu.pdf
    • http://cy2hand.com/userfiles/83815233702.pdf
    • http://shopphutungmayphat.com/upload/img/files/tomurideguwoligoxixo.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134cec23c5dd---futujudabo.pdf
    • http://steffis-strassladen.de/userfiles/file/puzukav.pdf
    • http://chizclean.ru/files/fck/file/tudawiv.pdf
    • http://pmke.cz/pictures/files/15457752984.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+download+epub
    • 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_off0000cd52.bin
97a8fc9a144e328f7d3fd6e55ab8ec864d7df44f2f432afb3fcd7f74ecdcbf42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 10956 bytes
font_01_sfnt_off0000e67d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 16792 bytes
font_02_sfnt_off0000fe8f.bin
2f992b27b5ed4eaf92d9d7f5da430684dc2527a5645ff9a150e7395f8b16473b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 16936 bytes

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