Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b53641ad23908c3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 13:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51e8d2e82f2aa05fcbce46819456a941 SHA-1: 1d4d4e867a487ead54e77b60018e45f92c403f12 SHA-256: 7b53641ad23908c37624e3c53d8b3bacf999e8e7f554eb70613f3552be640b31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or download a secondary payload. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rzn-house.ru/upload/file/25473848220.pdf In PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/rajoroburanuvamizewot.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/warativewemen.pdfIn PDF document text
    • https://12waktu.com/contents/files/sibafavu.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/95006677629.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/37253493766.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gonupejavuviwuku.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/tezumavagolilu.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/53892555644.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/99384793584.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/burujada.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/8149642144.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/42100411934.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109050422334801.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387d526a2d4---92196700427.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/juloxekojilusigu.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/lifixesepetotefolad.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/fotawemaxezi.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/mirewov.pdfIn PDF document text
    • http://intertravel.hu/_user/file/dixesofulejakagewel.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210906112209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kali+linux+android+wifi+hack+downloadPDF 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_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 17232 bytes
SHA-256: 332765a9db3d63bfe20b5124ef188e680c1e4df788b0a019ec7df40324ff5292
font_02_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 10544 bytes
SHA-256: e7ff1a7fcfb767f34afc56e307b97011b89c34e3e5e2537a590629cecc4b06cc

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