Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a55fbf7973b122e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 15:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0cdb3e6164cb366d3fc14b7aa5d66ce3 SHA-1: a9474f20dbbba1de556096351983a06ede975c2e SHA-256: 9a55fbf7973b122e8293ce4d554728a937f38810ac0da8059e255f7869ada2e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to redirect users to a network of potentially malicious sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://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

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