Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0a2befa256099a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 06:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39a000210df6ad4ed2e2928ce22e9cfa SHA-1: afc9a4ae98c796d3f6f9e8649739f7544c68247f SHA-256: 3b0a2befa256099a68d39c155f483258b24d2237bcdc6e1bedaf09269638dfad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to PDF files on potentially disposable domains, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jusumiwozalased.pdf In PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vibuzubegufodulap.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/21777812441.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/14841662847.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/gilokitevixabaloxe.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613797b0a0080---12744227830.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/lixokemolow.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/tikexexumopidoziboli.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/14346721740.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/64767332966.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/81154973954.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezosagosaxolifuju.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006a6e73d7---bopemevujunamesaj.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/70996093490.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/87386367907.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/detapikivuvir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mod+apk+of+archery+master+3dPDF 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_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 11016 bytes
SHA-256: 8b39b1ce273ffbceda50af78a008bdea4c145207870156846e8e25cc776f4b12
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 17856 bytes
SHA-256: 9fba5aa80222215a1a77d422a25bd7dcfdb811a25eda2a19124d5811326e8f87
font_02_sfnt_off00011e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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