Malicious PDF — malware analysis report

Static analysis result for SHA-256 421d36e4c858e573…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89f288afea867185116b54dda73d4ade SHA-1: e3428aba9032020cf1fb167846fa2de174e0c206 SHA-256: 421d36e4c858e57358dd83acaebe6cc77013b1606e560b1c56f04643e935237a
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 disposable domains and are structured as link farms. Heuristics indicate this is a common tactic for phishing or malware distribution. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kozelskadm.ru/files/uploads/files/14451905709.pdf In PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/zejuxovaridixusuzuj.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/34099651275.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/pideregugodi.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/guzivuvagojaxiwojuf.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/23203956566.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/30845753592.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/tonorigimafu.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/xadage.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210911035953.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/88851396008.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/jirepasavezubakotesaru.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/5535473042.pdfIn PDF document text
    • http://rinsacars.com/files/others/26338848819.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161327c70ed160---nefutijaf.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dc0b0fc4---86091090391.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/55828972141.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/780369119.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/66395393448.pdfIn PDF document text
    • http://esistore.be/userfiles/file/wokokosikunapimuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=appy+weather+appPDF 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_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 19744 bytes
SHA-256: e6711e04b80a30d33c0b13dfb5670252dd937ed5e58b279c49898fd7f653a0bd
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 10000 bytes
SHA-256: 858cffea30b66c81e150f92ccc024db96ca616cafe857e4366f4b8f66580e31e
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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