Malicious PDF — malware analysis report

Static analysis result for SHA-256 58092707555ab40a…

MALICIOUS

PDF

84.4 KB Created: 2021-10-09 21:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 521192c9cc2137d3614606b5a8683783 SHA-1: b56787f1b1f414bd502ed8504b1dda2691386f13 SHA-256: 58092707555ab40a3264790d3d07b06fb3ff48b2b8e783295522ed32507ca90d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript (PDF_JS) suggests an attempt to execute code within the PDF viewer. The numerous external URLs, many pointing to PDF files on unknown domains, further support the hypothesis that this PDF acts as a lure to download additional malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.potravinyav21.cz/ckfinder/userfiles/files/fojabuzi.pdf In PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winujoj.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/mewebuzo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jimove.pdfIn PDF document text
    • http://4rrecycle.com/files/file/xigiwuzunaver.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/ludasurumotunesukofetam.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/torumubosilurobu.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/97323687080.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/felipawudejibuzowaz.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/puxetizijan.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/sokomoguxakolide.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/37712581241.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/bubotowasula.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/90411679365.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/meguzinat.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/zokulukukusew.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/66045221426.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/pavunezedonarepuf.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/40563224681.pdfIn PDF document text
    • http://cl-pub.com/files/files/rumisetexapugemuwa.pdfIn PDF document text
    • http://inica.org/files/file///fawuwitibilolodikubuxager.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/jipubuxijerukolapod.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/30974217666.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/sumerezifeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=autocad+scale+in+layoutPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161498654848c2---zadevitiboxufakapekurekol.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_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 10456 bytes
SHA-256: 3eb78c2b7cd59c46d7e92878cd78e5e8e62397c644f1cd39016bc61836dc5778
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 21272 bytes
SHA-256: a62b0cf9e91d68e753c43d9ca7be7db6f34361ab6afe7016034fd71ef1f8889c
font_02_sfnt_off00012c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1