Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d257f796a38c66d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 23:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44144b8b06a784b1ef4ae8369228e623 SHA-1: 216820ce96dc3e9544fc7221b86e6dfc49b16a5e SHA-256: 1d257f796a38c66dc5bb46eeafc329576bd514aacf2e0add4099e626223a2926
134 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm with numerous disposable URLs suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://congnghieptauthuyvietnam.vn/upload/files/88534897552.pdf In PDF document text
    • https://lacausedeslivres.com/userfiles/file/9281321536.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210904153800791801.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ca80b8c9bd91ae472e049a1f4cb22edd/66517337679.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e310715902---sasumosalamebabosaxije.pdfIn PDF document text
    • http://amandamaitland.com/images/file/59423170911.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/desuxodujalotolunuju.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/9539150502.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/vekolep.pdfIn PDF document text
    • http://chinalabware.ru/d/files/ninakufamodoti.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/84836917522.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/62346932130.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/39803050444.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/tafamapozarika.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090612364973499.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/wuweki.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/34488427517.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/12379022035.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/wogeramowesagiwiwiwirade.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/80337193164.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210909_014621.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/79726613092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=motorola+razr+powered+by+androidPDF 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_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 19124 bytes
SHA-256: f10cc097d67d4aa540807524f730e177537f5f82de1c5064fc40af27390c7228
font_02_sfnt_off00012884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12884 10608 bytes
SHA-256: 929b001e23fada1ed595cc23d292cec7e9ad481ad47f31c426684525839e17f6