Malicious PDF — malware analysis report

Static analysis result for SHA-256 d522f4c7b60e906d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 03:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6bfa1604c6d08fb7e199f887cda3208 SHA-1: 5bcc3870f5188f2521d0e7ac6391f6c12e450159 SHA-256: d522f4c7b60e906d3c384f2906220d0388ffddec2c425898359fea163964a7c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The presence of numerous external URIs, many pointing to disposable domains, suggests a link farm or phishing attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://exam10.menapoint.com/app/webroot/upload/files/20859658130.pdf In PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/2892629854.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bc83bea8---gunarulifidovumobowage.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109141738525492.pdfIn PDF document text
    • http://master-br.ru/img/file/gexekozodurixiwodiras.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/pufubuguw.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/mujemivupu.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/68672435669.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/dolasizuwinibigeju.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/1045715219.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/wonenedop.pdfIn PDF document text
    • https://telenovella-bg.com/files/76342086746.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/95369764285.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/41745473583.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/pojagilogela.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/juzobazalefitap.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/disurunurenejumakegotozud.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/putanubudazeruzolutoxowew.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/70543474692.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/54677432631.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/numobagifi.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/bufusomajuvetigiwepup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=english+file+4th+edition+elementary+student%27s+book+pdfPDF 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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 18124 bytes
SHA-256: 627f0d75c43278b954ae0a6be4f1fe9777a77e1ab82bf6ec192e6f0f60839069
font_01_sfnt_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 11488 bytes
SHA-256: c102ea3c179cac07af2c850bd52a8d3cc396a389356d5450198bd6b3e6c67baf

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