Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d58146b563bb105…

MALICIOUS

PDF

91.3 KB Created: 2021-09-09 22:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 841ddb4a8159cabbb7ad0c8040385eb2 SHA-1: 8e5894558b8968dfa1ef85e84d42dc129fd4a32d SHA-256: 5d58146b563bb105c1b635dc07dfc2d4c596fa3cc9948e6b45b5962f89a82c04
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a phishing or scam website, as suggested by the heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the presence of numerous unknown URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • 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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gbhkus902rck0omjr6ermi6b7k/46755613911.pdf In PDF document text
    • http://fine-cottage.ru/userfiles/file/8266973574.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/31046229846.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/80591669204.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a9711daa5---nazejaratelikotij.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_971C061AC63B223F.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/worazakolojunixiki.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/dujafet.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/nozovuwolukopotigoki.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/nofilazugivisubiw.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/85811761779.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/10463311317.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/xadudufe.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/11431875311.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/dufubazas.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/resumamasogeresemiju.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109030952386048.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/97686110581.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/90058471361360113579f0.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/wotovivifi.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/rupuxewog.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/86462168381.pdfIn PDF document text
    • http://erex.hu/upload/file/jutazurirevofijuzoporux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=windows+movie+maker+freePDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/tanoxuduzatenononatute.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_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 17404 bytes
SHA-256: 4fc6078f96f71a1ae936006064ffc21d5fe0be2a452c65b27b0a52fd67d4eccb
font_01_sfnt_off00012f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7A 10608 bytes
SHA-256: b2d5769015d39f2c3c728b6c40fead93dd0ac52cccf6ab158e4a23c13f0616aa
font_02_sfnt_off000147c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1