Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d26c9ed582f39d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 18:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1142ab5b42fe7809aa19512912917193 SHA-1: 7861f35158c4140d58223dac592cc55cf7dc9a7c SHA-256: 49d26c9ed582f39ddba0cf8572bffabdfc35f9b59ecf1fc271086fc2ab504527
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of multiple URLs and the nature of the PDF heuristics point towards a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=cara+rename+aplikasi+di+android PDF link annotation
    • http://pb-book.com/user_file/file/xuzatodisowotawesojajip.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/kejosejugumani.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/gudavuganovifeneke.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/todosuzedivikesubi.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/depoteziterovotafigupibuv.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/wepuvajurakijemuxujowalo.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/vobigawaraxetepozoro.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/40623043085.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/66883940596.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/kemubekosubu.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mezozesuridipap.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/nemuwizolizubawanoloxo.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/gezodanuwimoxe.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/sitapusaroposojajugunoxaw.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/xabomavi.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/xewugobekumidizagajop.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/82726907804.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/zulelibiwejuvofekud.pdfIn PDF document text
    • http://byecook.com/ckupload/files/gedub.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109041432539900.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/dugejap.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///51165834796.pdfIn PDF document text
    • http://topp.pl/_topp/file/91037272476.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/dad2dcfa1b3bcfc7e7bc7f6ef88f6e61/fofenilopevokex.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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 17472 bytes
SHA-256: daf11fbf2aae6ea2f2721fda10d5efa5aac8e43569be6f1b35fd9a4a8d7b2280
font_01_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 10576 bytes
SHA-256: f3b67cdaebe6c47f7d9d2cfe69860787fa501f229435735922e58ac6f19c71d4