Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd83c8c488a4219…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 14:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb7fd72160852a603111febcb4bb344f SHA-1: b5eecc368433233d28ee56a3de86360e76251f00 SHA-256: 3cd83c8c488a42193a8edfd2778762010d6d68e5fe104b8fe74cedb6082edd79
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://modero.vn/upload/files/demovizirubiparesabaxe.pdf In PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/66563574460.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/seripilapeg.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/97716450977.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/pifukasajuvena.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0af8e5da9---51150459613.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/denusugo.pdfIn PDF document text
    • http://mfahk.com/upload/files/ketoxixodadikanadekan.pdfIn PDF document text
    • http://bienbao.net/uploads/files/25935524198.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/3824229005.pdfIn PDF document text
    • http://malifer.hu/upload/file/pitubikokixupedu.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/29403882987.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/fifelugodezesilob.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/45345004980.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/wopilososew.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/vuvute.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/lonit.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/82924997052.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7g20blsrlmlgdts1r2kormpt0j/gokapal.pdfIn PDF document text
    • https://hsse.cl/files/redorasod.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/38484519911.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/sivapazexita.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/53270823404.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/68284339692.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/67776787805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=spider+man+far+from+home+torrent+filePDF 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_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 20048 bytes
SHA-256: 53f6175fe863d64ad2c08084eea851ed028f313be3f4bae8bbb4293dd9b8fca1
font_01_sfnt_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 10672 bytes
SHA-256: ab597c213aa80cbc7fdda62990a28a9a9fea63ba50ee2b8e84e74ffb166f7120
font_02_sfnt_off00012b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1