Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c02ed39912038d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 23:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 257d46f1fa385f6c9fbd9a11b823b0c3 SHA-1: 6bb60121be23e564e06f5e47df1558b8a7f92a24 SHA-256: 90c02ed39912038ddca894db9798f4a384b9dfb2cf4124d87d9187ce16c88e9c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7744

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 https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2af3b4f1e34f136349e9fb5af1cabe9a/xewunibemikuniguxunepaj.pdf In PDF document text
    • http://christopherdallo.com/file/sanowekusotufet.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/nosoxoji.pdfIn PDF document text
    • http://brukbet.com/user_images/file/14635776193.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/xefogo.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/99428721229.pdfIn PDF document text
    • http://polipack.ru/content/file/14304790205.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161373b912d498---13373001634.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/nubawomavipuwozowaxisiloj.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/13671862835.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210909061326.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/kolofizoj.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fuvabakulafakabivewibov.pdfIn PDF document text
    • http://espwireless.net/uploads/file/zuxupabatosijodibutekug.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97710054536.pdfIn PDF document text
    • https://nistd.in/userfiles/file/9569519885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bluetooth+messenger+for+androidPDF 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_off0000c8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EB 17860 bytes
SHA-256: 7dbfff661247ae9949f3a9d6e151d9785d5c5319123f84fca5d022b70b20f2bb
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 10956 bytes
SHA-256: 784d6400250c2ba0581dbeade2fddce1e519f212dd092c03c2805294c279a659
font_02_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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