Malicious PDF — malware analysis report

Static analysis result for SHA-256 1828cd60567effe4…

MALICIOUS

PDF

77.6 KB Created: 2021-09-23 14:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1d88f7189c2ed7fce13b2b4166ded5f1 SHA-1: 90253a6909ed3965741a97bdbe37370473973b0f SHA-256: 1828cd60567effe4cbe4841767140943081ddc8bb4e8ba8b229236fdcc56ca49
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to PDF files on distinct hosts, indicates a link farm designed to obscure the ultimate destination. ClamAV detection and ML classification further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6381

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://newsru.md/upload/userfiles/files/41137407873.pdf In PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/dalofijasopurogonijenisa.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/dewamas.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kivifegotanelumunaponij.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/piwope.pdfIn PDF document text
    • http://tyextractor.com/d/files/72203265568.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e2cdd01d5e65eb51283bf3470bd3592/jezekugenud.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/fazavepiputuwijifep.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/nemixe.pdfIn PDF document text
    • https://foulardfotografando.it/file/74425829835.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161356c67c95eb---zumuvitarivojoxizutalet.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/54749076841.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/tapexafezezitatupi.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/zelorep.pdfIn PDF document text
    • https://jurad.eu/files/file/32853361634.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/86076187170.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/zuwugemojekufogunolabijiw.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/rezijimakupitafijumifibex.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/18535669107.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210923_100458.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/setelemol.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/tumirilenepevubam.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/43978292679.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/62956502987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=winning+eleven+2018+apkPDF link annotation
    • 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_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10596 bytes
SHA-256: 72c751593c957964bb693bbe0e482647a9b75d6b11cab2ba2c25272f004fe5c8
font_02_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 17696 bytes
SHA-256: 1433b6ff2d573968b701df9541b4f6d92fd44f4e0272d075e571ea2532f48a9c