Malicious PDF — malware analysis report

Static analysis result for SHA-256 9031c7f6ba2ec6e3…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 14:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d2992308b37a86b5009029aa3140b701 SHA-1: d24fae90278f6209a348a6a423a6022ab4ccfda7 SHA-256: 9031c7f6ba2ec6e3159338183956151361732ba042c09e19be54a29b91779025
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are embedded within what appears to be a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and the link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=gta+iv+obb+file+download PDF link annotation
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/34704909844.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/nibabutefujom.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/derelosifegimoz.pdfIn PDF document text
    • https://digireg.org/upload/zukekelujelexepipukakevi.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/38309698410.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/iu8j5evq71jo7uqpb0k9i0podn/mokowalufikiporexusugit.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/wozasitefanuwika.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/xiwelozafukinaf.pdfIn PDF document text
    • http://rnralpha.cz/res/file/topubifav.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/93292691653.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/fawifopoki.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/67098367525.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/sokiwepuvupajujevewo.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/62043303347.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/5918418969.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/68147383474.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109072346199956.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/kunisudisarikurapi.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/11475733084.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/55694621742.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/47831515666.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/wivokavonidulagisi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16147a1a8ac8be---petazavijikigo.pdfIn PDF document text
    • https://cardolf.ro/files/4160660300.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_off0000afb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 14868 bytes
SHA-256: 8268955de4fae5fe237bea0f11643acd7085cf317adacaba61f565f9cb3c44cf
font_02_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 10408 bytes
SHA-256: 983157ad867a2b11ef33b1488767a6ca4ad44f3128e456b103cbb32bb61efee7