Malicious PDF — malware analysis report

Static analysis result for SHA-256 284e6d8df8115b5a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 05:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c89ba2b8240f5b75a9f8a34ff2b1de8 SHA-1: 0b9068ff38a088e798ea8a1069f9fb70e3575f25 SHA-256: 284e6d8df8115b5a399a9013474bb7ad15007f118c284a37c7bf741cc2554dea
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and employs a callback phishing lure, prompting users to call a number for fake issues. While no scripts were directly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites or engage them in social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sochi-riba.ru/ckfinder/userfiles/files/77835555047.pdf In PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/liwaziponodepenogovoze.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/jegafojuguxukiwegiwaxo.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/52959448787.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/pumilufapugavasitow.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/71969646053.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/xikonefexuvoz.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/30403600492.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/nizizozapebifutijakam.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/wudivejudeji.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7580709820.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1631756216.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/23203956566.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210911042627487.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc5137bd3---viluruxojikemabilazawixe.pdfIn PDF document text
    • http://trivio.it/userfiles/files/gejovoponipe.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/20797465654.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/68522803578.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219931036299.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/fozeras.pdfIn PDF document text
    • https://ms02bet.com/contents/files/jijezokokixizuv.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1n445o56cpcf2seoaltfk5fc24/kedalivejajalubiwar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=c%23+degrees+to+radiansPDF 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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 18592 bytes
SHA-256: e36ba595e2e73d08a1b1691928e99392da881ea1733579587bd88d99b76549ef
font_02_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1