Malicious PDF — malware analysis report

Static analysis result for SHA-256 8450f5d9e45ac520…

MALICIOUS

PDF

77.0 KB Created: 2021-10-08 18:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aac29cd5761de05911d8c883e6b082ab SHA-1: 3bf4ac5f90c4786e36eb03aa338b1716522f8971 SHA-256: 8450f5d9e45ac5201f38b21d97bc66391e252f7995c48c79963728a840b0d1af
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://asiapharma.la/files/files/34137933623.pdf In PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4094bb3585632f26804ba899a0e23196/50682530489.pdfIn PDF document text
    • http://keyday.ru/files/files/82935448323.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109190858082413.pdfIn PDF document text
    • http://special-pharma.com/upload/files/83841079999.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/89165905189.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/12146287230.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/87452561897.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/41835854094.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/93331248914.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/52080215474.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/verudaxefetefegusomatagij.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/29690675870.pdfIn PDF document text
    • http://3m18.com/images/editor/files/26805857487.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/nefopu.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/jiberuxivezilonopuvi.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/defakatubonafimodawa.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/nebuvunigigolu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0d4a66e7---lufewadegubupa.pdfIn PDF document text
    • http://fitviewer.de/files/file/zovenafalusam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+draw+anime+girl+step+by+step+for+beginnersPDF 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_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 11172 bytes
SHA-256: e2b76ece24d336e9d752a1440dc413620592d66206327d02e9dfb96124d88bc1
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 16344 bytes
SHA-256: 6f5e1a69b1724553d172b71bce74f4011550ede418d34074ffbf701a92670861

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