Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e6d5caa3b7b9cb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 09:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8111ce2b93b066d50f7b5d394780025d SHA-1: 88048d87e3f483c2b41d0ec7682375c27c3c8c62 SHA-256: a6e6d5caa3b7b9cbba4998626537cbcaaedc5719e57e347a07d5878d89052b04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, likely to redirect users to malicious content. The embedded URLs, such as http://stkvn.ru/..., are part of this link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/30afc3c33ebcc20043958ed3961325cb/sisalewawevixozamugise.pdf In PDF document text
    • http://gjbbang.com/userData/board/file/sutezokejiziz.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/zevuvusakele.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/bf33537686f189a54c848a3c8ad693b5/sogesajiwirawojizex.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/kudomivezekul.pdfIn PDF document text
    • http://asid.rw/userfiles/file/46174192616.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/67694479537.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090823561873499.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210906_CA7658F5FCFD4962.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/74263279124.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/digixedulaxusazudejeg.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/38571742950.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/26333607257.pdfIn PDF document text
    • https://hoavily.com/uploads/files/46023666291.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/fenedajomasopamugepa.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/7210998885.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/tifuwoninif.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/86099550823.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/figug.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/midewu.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/50363235276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=drivers+android+windows+8PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 17868 bytes
SHA-256: 57187a250ef2b6cb1252fe9121b342e7fa99fbd939f4b21234a7e57fc90a763a
font_01_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 10460 bytes
SHA-256: fbdd98eec6483448baaa57d8580284704137ef9c586ad05a157d140fae2b7caf

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