Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cedfe00ad2d2fac…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 18:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9cca2d97976eb59b12b54758d5721fdf SHA-1: 21d6050cac537ed3a4211c7b45e509efc199c306 SHA-256: 5cedfe00ad2d2fac6adff674d2c168bffbaecab4d265c60ae8b80dc52549a3fc
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of unique external URLs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f80a7f538---86884503478.pdf In PDF document text
    • http://gusanhightec.com/userData/board/file/16571403148.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/47025404366.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb4580aeda---57737209141.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/50754951853.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/vujiwuvixagenuvodazixuru.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/84727988860.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/rulawuridixamibukagaw.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nifalarejuzelumojugi.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/nabesiwikipelabipejuwatak.pdfIn PDF document text
    • https://people11people.gr/uploads/File/83765822206.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/lunadewezeba.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/bozirovulupixumudelatunos.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/62090044896.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/potupire.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/lakutanitamunoj.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/gewiregexirelol.pdfIn PDF document text
    • http://hangquangauto.com/files/ledogodarepod.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/virunapilelokedokiz.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/11854726619.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/xujifuvelubel.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/81396155415.pdfIn PDF document text
    • http://kyea.org/imageuploads/dorefotalotadimidofa.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/77948902737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=spider+man+movie+online+watchPDF link annotation
    • 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_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 16920 bytes
SHA-256: 5cbe857874fb6ccc254836681ba6f20b5d6e3dd1773d09ea4eb20506121d5ad0
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 10840 bytes
SHA-256: 06b8246137d1d7c4083f7b18eb77b02f786e93897b69c51a3b6b38a06a9e5746