Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5614cfcc0a61a37…

MALICIOUS

PDF

80.7 KB Created: 2021-10-11 06:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 409f2f2e5df7c46c572c9c63622596f9 SHA-1: bd97f9cb7b081641905cc342b965b3f38480a24d SHA-256: b5614cfcc0a61a370ee47b1d0d67e571e61db2106cd32205ffd4b6eb5231f711
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 links, many pointing to disposable domains, and the ML classifier's high confidence score indicate a phishing or credential harvesting attempt. The embedded JavaScript likely facilitates the download of a secondary payload, contributing to the overall malicious intent.

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 http://sksound.com/userfiles/file/tadejetizomef.pdf In PDF document text
    • https://mehreganimaging.ir/images/upload/files/7105627922.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/98760787909.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/25488971399.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/fusawatenolabosi.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/53330446108.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/77997414221.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/67055214687.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/77734018158.pdfIn PDF document text
    • http://chineseclothingonline.net/File/90498517361.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/sotukeridegosatak.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/80655607189.pdfIn PDF document text
    • http://serting.eu/userfiles/files/97286658736.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be900f6aa---75752478395.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/wosofufapupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+role+of+carbonPDF 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_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 10568 bytes
SHA-256: 43f83bda4cf8b4216833571264f82b256072d6dc1424f31d8828051b5818c4b4
font_01_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 19304 bytes
SHA-256: adafbab5e134d96591e55b8229e605a99168378c67fafcd5fe65aded64901af8
font_02_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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