Malicious PDF — malware analysis report

Static analysis result for SHA-256 e840e9fcc83e8d9c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 15:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d91af42b5693bf550b29a4b59e82cd7 SHA-1: 9bc5b9cdc5aac751888d2f210ee2486ce57920f8 SHA-256: e840e9fcc83e8d9cbdc22715e86f896bba57b969c6f6ae598124a1f8b9bd3fe9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huh.hu/UserFiles/File/nulazinedego.pdf In PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/54706729368.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/88397867712.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/51721784562.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/fakarivito.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/kivafakafitew.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/58115582254.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/45889675298.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/miwawuzis.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/vurazu.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/76071031968.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/xutebuselamikofifol.pdfIn PDF document text
    • http://cpils.com/userfiles/file/povebisimepekererodi.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/91112861939.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/donabe.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/vimivejuwefozinuwi.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/masurulikisofafesatoga.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/57639618281.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/42079653125.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138da419c602---91428522418.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1tmfto9qjf2di0d7783dp8tvf3/pudelusofutabupizuvotuko.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/dapozuwowiwozivimevaxog.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/ruwukuzananasibedupagoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nikka+zaildar+full+movie+download+hd+720pPDF 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_off0000c35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35F 11168 bytes
SHA-256: 0bec4ce54e43ee8a5ae4a9857b1a2261a34f2339a0b44686b0cf30d2854580f3
font_01_sfnt_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 18072 bytes
SHA-256: c79c9cc977b887b7c4428a8960a3ae718b070ea3336aa7c614504d2e1cd69d54
font_02_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1