Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6c27349e4713c7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 12:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40324111bdf39899c838e37678f6825e SHA-1: 3c5878544b0ea99970300c2bee55f64699428388 SHA-256: 0c6c27349e4713c76c2c33016ef827c49be2f0284a2ae4f47d105cd2013c5198
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, a common tactic for link farms and phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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
  • 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://usaoxin.com/userfiles/2021-9/file/16915646562.pdf In PDF document text
    • http://steffis-strassladen.de/userfiles/file/lejusajokeweso.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/lolugemenavu.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/96604920816.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/xobuginoli.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/47283846626.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/66011843606.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/somogoxipuxiwuv.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141bad1cc805---83555238540.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/34140038142.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/jilikijugekodavemuzesus.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/menokekododofiz.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/zikanonixekola.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/17814881471.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d25f297ddea411af06f1bfad31afb049/tesovujekonitariga.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/muxadebudekurururez.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/tikaje.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/kawituxut.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/87293857498.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/falaradibamokorabosezar.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/72814169682.pdfIn PDF document text
    • http://immopolignano.lu/images/60735559169.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/xerazoguroponunisegunupa.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/9994411591.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109080248512726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bertram+g+katzung+basic+and+clinical+pharmacology+pdfPDF 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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 18424 bytes
SHA-256: c38cc7bf49c3ffb7810b0dacd7407b5dbc1a4c121347c7fea407beae62a98c0d
font_02_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 11628 bytes
SHA-256: a5bc2389d9c4abb18e259f481a6a2773e47de9722b385d80823abedd6f2c3528