Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6310b58b4bde3a5…

MALICIOUS

PDF

69.8 KB Created: 2021-09-22 23:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 581a1ee7608e4cc5162cc3266a165e3f SHA-1: 532714b7d6c2416235da5a83c6424b21f1a02f0c SHA-256: b6310b58b4bde3a5efe3e899e29a6f505ade124fe8fc32583d2e45078a0d67da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host a large number of links on disposable domains, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://costarica4d.com/contents/files/47475186590.pdf In PDF document text
    • http://gdgom.com/upload/file/210907150359342841no5dy3cs0n6k.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/gaxoweja.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/49232342952.pdfIn PDF document text
    • http://aweibel.com/Photo/file/nowuluxiwularadajep.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/vavolojutesazuduje.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/89660778096.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/waxojaxiwibaxeremepenig.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/muxemusuwad.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/mevipimomodi.pdfIn PDF document text
    • https://adium.ru/userfiles/file/83963787801.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/pebas.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/wuruxagutewewume.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe7a865a6---55729689979.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210916_2FF4CD7EAA91B411.pdfIn PDF document text
    • https://senfina.top/uploads/files/raxidalo.pdfIn PDF document text
    • http://sayarbobinaj.com/file/zazitezokowa.pdfIn PDF document text
    • https://davaocarrental.com/images/file/94669467234.pdfIn PDF document text
    • https://telenovella-bg.com/files/gulatagose.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/55680235115.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/57979132398.pdfIn PDF document text
    • https://laser123.com/geektic/files/61762635965.pdfIn PDF document text
    • https://solturism.ro/images/file/59591944299.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/40112921571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=three+kingdoms+romance+of+heroes+mod+apkPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/26701805697.pdfIn PDF document text
    • 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_off0000b0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A2 15652 bytes
SHA-256: 2fc3201cec5492db0062b9d4edcb643c618d8141b070c79e0ee85c4dac340c1d
font_01_sfnt_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 10980 bytes
SHA-256: 6e1a05fe1f388a7334f491f6025a25da3b7a400de3f28309ce4e8f9827ba19cc
font_02_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1