Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bac1454da27fc24…

MALICIOUS

PDF

72.9 KB Created: 2021-09-20 06:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eddfe6932bb60061232d091a6a3304c3 SHA-1: b721c7a6f917fe27f717e009c53846b019a7bd94 SHA-256: 8bac1454da27fc24c3d67b9e6fbdb71e915898471d45b2c590598170346ab47b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, many of which are part of link farms designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown-reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=pokemon+leaf+green+version+download+for+android PDF link annotation
    • http://daoltrading.com/userData/board/file/wowuxu.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/wilefozojefeg.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/90093007106.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/rusereteredujuvubamesevo.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/45946083685.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/gagelatu.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/miziletila.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/vikejivudiji.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/77945638409.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/39335375950.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/33652858889.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/kiwimejevakipebudazup.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/62704618494.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ec0dc68d---55695326543.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202195203047809.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84353093950.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/60060545111.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/kupozuxiwufemivasawaravo.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/11278765540.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/ponetasopupukudij.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ca4ded852f22b7ea0d1279cd18af1f65/dorozudedejufufoki.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/fisamogirimovux.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/kixezigem.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/walanoluduvo.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://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_off0000b7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A3 10844 bytes
SHA-256: 0a3d82efb6c53607ba56f2e8012910905a9e48d0758a9405fc4991129dfb65b2
font_01_sfnt_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 17552 bytes
SHA-256: 2ddd6e74b29cfe07435f254d9121727eb6230135319a0a63bbf10f5f2fcd8866
font_02_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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