Malicious PDF — malware analysis report

Static analysis result for SHA-256 498b7819f717cec0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 01:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68e91ad08c1d3c6f982b57a970e156cb SHA-1: 48bae3b838f075cafe44bab323843a0e88092c01 SHA-256: 498b7819f717cec0115c91d7f59a5ffa4a29f050977ac433e097591edfd64f61
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate this is a link farm designed to redirect users to potentially malicious content, with one URL directly pointing to an IP address. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bimore.vn/webroot/img/files/4907681686.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80346a573---vugasusufokipu.pdfIn PDF document text
    • http://zeci.nl/im/image/47147591875.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/7314791776.pdfIn PDF document text
    • http://domainecomps.com/documents/files/gogorozubud.pdfIn PDF document text
    • http://roocenter.ru/upload/file/nisiwavuwenozisivub.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/29443556405.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/14344923510.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/7374832593.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/sodapitaxiworivise.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/dejujigubaxo.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/wexewizurogatijo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/68ccab0c55eff0ff0e882325e3032fe7/89638208770.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/kaxomowutudevaje.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630572693.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/88639035515.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/68491015914.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/munumibuwofivurur.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210902211016539272.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/furapafu.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/72014604985.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161303153893dc---13732932918.pdfPDF link annotation
    • http://ubest.ru/images/file/11051891876.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/voxufiwip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mirror+cast+phone+to+pcPDF 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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 17768 bytes
SHA-256: 33d92a9acb944b2f3cc7fe8bc5855d6a5b2932bc634dfa51f3a0a66fd5b58835
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 10420 bytes
SHA-256: 4fa43357b8f7855c7dc1c062aa7854723c19520fa3395570c67c549da476aef1