Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67815f445e97dba…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 07:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: df07756a57936741bc756a68066945ad SHA-1: 5eabbff198521783b95f72dd58348bd64ce35137 SHA-256: b67815f445e97dba54f90be225ad3658a3cd76309d3686566ce0fd44ff41b62f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support maliciousness. The embedded URLs, while many are benign, point to a pattern of hosting malicious content on numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://greenlivinggarden.com/htdocs/UserFiles/file/pinikafegugofuzigiwowo.pdf In PDF document text
    • http://kinel-hunter.ru/upfiles/file/55698070265.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/16195878443.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/29598899932.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/dajamik.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/kuxuzepuwerijipopag.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/82671144178.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/28672500578.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/36964651621.pdfIn PDF document text
    • http://195exim.com/datas/files/kabokimejosumu.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/mular.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/dadowujemevowom.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/33733396788.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/neguveniwubukavasituza.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/vowijijotesozotirej.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/luwupilikobebokumero.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/32178342484.pdfIn PDF document text
    • http://alvitraders.com/files/nekalotixasidolosifeme.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/bafogavoviwolij.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f7572e8de0b8de95a423be9b1086104e/14068895764.pdfIn PDF document text
    • https://best-label.com/upload/files/laxurenafafijuxizenogaxi.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/71232095717.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/66340565183.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/82097739111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=depura%C3%A7%C3%A3o+usb+androidPDF 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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 10948 bytes
SHA-256: f51054d14c5b1be73709852bc43b7585c0e4b36081a1aa636c3eec06e64e63ea
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 20468 bytes
SHA-256: b36d3b414432129a6cc63e779ccb881abc07d7cc5a9b928a64894327f89868ce
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1