Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a96b8b3178dc878…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 16:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c8b5d7f9c9ec06bfacee1d3c44d1bbf SHA-1: 59bdbcf60802dacf168ee91f23e96d8581d1799e SHA-256: 3a96b8b3178dc8783ab99cd4b1ee31b9aca42269ae6b956fb188ae0a14d6e1f5
124 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, including erh-hu.com. While no scripts were directly extracted, the PDF structure and its nature as a link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6883

Heuristics 4

  • 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
  • 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://erh-hu.com/userfiles/file/dufakipilijatumajoro.pdf In PDF document text
    • http://dagmar-e.de/userfiles/file/xabamefidi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc6d9d471b---45998922766.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/jazininorogoveb.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/gavoziso.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/nosorawujoremowosafasodi.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/woxakunofutosekexi.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/vewofiwu.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109021456223002.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-15/887c785c9dfefa3756640df6f5a8d788.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/zibinurodozevujijonix.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-16/images/files/19956039724.pdfIn PDF document text
    • https://clickbox.ro/images/file/16022405891.pdfIn PDF document text
    • http://workontext.ru/media/file/54906260004.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/gopidepop.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/dogufekemiwuk.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/vuresawafukevimixaru.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba628f870---dogofeleko.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/rabawisexijor.pdfIn PDF document text
    • http://fittbikese.hu/files/file/venaxikumalagole.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/xupumatugo.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/gapujumojasamuw.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/kaxomowutudevaje.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/51369862116.pdfIn PDF document text
    • http://kag.fr/userfiles/file/3924496370.pdfIn PDF document text
    • http://portableandcool.com/files/files/dufolari.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/nukazuduzuzopadafifefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=you+were+born+rich+pdf+filePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 19152 bytes
SHA-256: b34c83f4b0aca9bc0eb6cc18bb7457ad11b9718580fa355e09a71bb454407cd2

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