Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53e24296547729f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 15:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f517d79989d0ac7c7e679e6d9d98e1ef SHA-1: df1d781ac6cfb627d8b956cecd70e93aa34f074d SHA-256: d53e24296547729fa40a3004a41572756704c9f5ed676039c5b7d97e9f5be864
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised websites hosting other PDF files. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing sites or download further payloads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using numerous distinct hosts with few links each, a common tactic for link farms and phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://lezeckastenakosice.sk/upload/files/96841830418.pdf In PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/30815033596.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/wemebude.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/53793140859.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/fumoxoxavak.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/dexemagixitimazuruxexejaw.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/86505497803.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/xuzetatibekutat.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/37409771653.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/wazunepimimekunopok.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/60263525074.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/wugib.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/lazepevigagapef.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/tapabeko.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161369501c902f---nufazenoxosax.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/zinozevuwiwelisirisepugi.pdfIn PDF document text
    • https://shunnasato.com/waloduvej.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/65458588345.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/fevanotozexalopamevememum.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/puduwaxag.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/70895261571.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da5b22f01d---77074951905.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/77776997798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mod+apk+fruit+ninjaPDF 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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 10460 bytes
SHA-256: 9e9373348b7d7ad12e8d17a28151cbfb907952b5f9300b9133cba7be0892ed3c
font_02_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 18300 bytes
SHA-256: 2928ae94620e2969d5a6b674aa264f3e2bd4cafa755a18108c36ce8f167b9abc