Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5075dc5dc1a697…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 19:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8409d88b8da8c502eb0aa3d01dc202bf SHA-1: 43db9126be3ec99b98c6b4fd8f1b2a0fd74db2e6 SHA-256: fb5075dc5dc1a6974f8d67eebc60764dc42e13c9ed0dbc8a6c50c020766ce2a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and the link farm structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • 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://huntic.ru/uplcv?utm_term=jurassic+world+the+game+mod+apk+unlimited+everything+2020 PDF link annotation
    • https://responsible-tourism-alliance.com/content_file/files/tadiledofizogoragimusa.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/visuxuje.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/8363621187.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/41841726118.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd695e9a72---vosetofopiwebowolesak.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/32541605657.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/sanoxujenajij.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/79849019893.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/visegegazapokisifapose.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/79232333670.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/munir.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/34934720313.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/gupipevajonosobatisozep.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73030177723.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210913_4E875BCE043A2E5E.pdfIn PDF document text
    • https://fultoys.com/userfiles/32603680380.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/99246873049.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/taziv.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/30724799017.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/16123572030.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/varelupololor.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/rekidifiz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b861724624---47559304838.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/37108390161.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_off0000aed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED8 11652 bytes
SHA-256: 81fe8989fec51c1b8baed582637ffab7c8cce8d069117413e81bd8c41b10d6bc
font_01_sfnt_off0000ca57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 15000 bytes
SHA-256: 3b7f5c5419da1d111629e9b935183b28cfdc8c097848c1e67a9c52b8372eddbb