Malicious PDF — malware analysis report

Static analysis result for SHA-256 13753dfeb9d3aaaf…

MALICIOUS

PDF

74.7 KB Created: 2021-09-24 20:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2973c335a6c5d3ab9755f4ebce3370bf SHA-1: 2bd7edd1787b1ba746ac57a758bca1e0723aded2 SHA-256: 13753dfeb9d3aaaf075c6aed8e8fc8206fb540c25b793de2133867f63b49e318
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload. The embedded JavaScript is the primary mechanism for executing malicious actions.

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 http://belniig.by/public/file/63481567642.pdf In PDF document text
    • http://intersonik.eu/upload/files/6969886013.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/fb8d670ecd68a096371b4983fce5633c/60321352552.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/107945689.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/56207800578.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/17028580688.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/76525869732.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/0c518f9d1f96faf73f74eef0e489c117/8683465862.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/80671381593.pdfIn PDF document text
    • http://pinxedien.net/upload/files/xamasojedif.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/52919952340.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/vusare.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/nekikolukonereb.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109190953229962.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/16681961256.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/rurotewisuvawo.pdfIn PDF document text
    • http://odumakus.com/uploads/files/82743638440.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/rixufikudenejiju.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/88906450472.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/xagine.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/mujuj.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/99867449404.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/25315155982.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/70777381616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+java+heap+sizePDF 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_off0000b7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 10584 bytes
SHA-256: 3bd60cdb42910f9c30cef179c983eeb8f44c2a0f0446aca5e91270981ae5639f
font_01_sfnt_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 20456 bytes
SHA-256: 1aaff861071eebc7346e34fef60d9c950cca441d97eb79f206e18c60bf73e174

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