Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c57eaf0889d9486…

MALICIOUS

PDF

98.2 KB Created: 2021-09-17 18:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63e7d7f6b702f53341cf958c8b34ecc1 SHA-1: 7cd645f253fbd33057d5ec7f0b6ce75c76317a28 SHA-256: 3c57eaf0889d9486538465367d81c39ce47d9b3bf43b5ff5427445f1e6e4b012
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to host further malicious content or phishing pages.

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 https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34744e555---40118244446.pdf In PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/zasajeripazujidodepixux.pdfIn PDF document text
    • https://asken.as/bilder/file/13353588536.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/sulexezi.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/39905556846.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/8205484564.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/gatoto.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613c2a0d1fcf5.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/36946465171.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/jowisoxenoti.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/22645844637.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81341376131.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109080803542866.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/50465971153.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8d5088a8930bd54b6893edc45c88b31f/89192555524.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/74220758581.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210910201958.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/12966862597.pdfIn PDF document text
    • https://stormester.no/files/file/kafitufob.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/29167855471.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/25268156699.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/besizarotonifubalajupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fundamentos+de+marketing+kotler+pdf+11+edicionPDF 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_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 20392 bytes
SHA-256: e358dfdc3742d31fe3fd5cd118ce2c8e0b2d52e87a0b9a80d424bd09c7f0980f
font_01_sfnt_off000148b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D0 11184 bytes
SHA-256: 2552dfa7ee6baa4172ffdefa6ce268fad8c47cf45860f8d6f46f142aeab0281d

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