Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1b190328b122cc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 05:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 047842d4bf101f775b8b4eca98b9a150 SHA-1: 4d637a70dc80efab889af97b6522838e10eebd86 SHA-256: 5b1b190328b122cce755a8d2fc33f72d19ffe6678d69600ff110e8af2837ee30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to host many links on low-reputation domains. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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.
  • 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
  • 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://synerhu.ru/uplcv?utm_term=poco+f3+geekbench+5 PDF link annotation
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/gobatumas.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/55350812652.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/savuwafubejinakikuzeri.pdfIn PDF document text
    • https://ip-pharma.net/data/files/99243704139.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/sefali.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/77325390204.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f7f13071---wugadimup.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/28295004280.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/9614896784.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/kusadam.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/daxonetufofefakaren.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145623873055---xaponutulurax.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/71438720996.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/40619091210.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/noxebeb.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/wikakar.pdfIn PDF document text
    • http://naviway.su/upload/files/gamikedatub.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/905974570.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/fulukabetuzuxodapifubojuw.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/97850051700.pdfIn PDF document text
    • http://hanleyresources.com/images/kajonodusi.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/16839339265.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/ruxidisugo.pdfIn PDF document text
    • 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_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 10488 bytes
SHA-256: 363e31046604d509ced4906c36a9a77f6a084980712d33a9cbe543cab1ee7ee4
font_02_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 18224 bytes
SHA-256: cd5e3744743a906c89f4435df9b530b0177212990dc7827ed5263b6efd1f1dce