Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a212e262239001…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 06:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 863396485d7f31feb385828f4170685b SHA-1: 659527c75d6f8bcdafe93e29593f54bc660a5c2b SHA-256: a4a212e2622390011e490609fda040bed7758efce8a902b894676ebf4d62bc40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs and a link farm heuristic suggests the document is designed to redirect users to potentially harmful websites. The authoring application 'wkhtmltopdf' is not inherently malicious but can be used to generate documents for various purposes, including malicious ones.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bd830acd747347fa615bf61dddcdad37/66796821952.pdf In PDF document text
    • http://nutranghongngoc.com/media/ftp/file/dufovebovuzowosifoz.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/5727441521.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/67650980049.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/vofazobewim.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/jines.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/84574124026.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/lekunilafoguxini.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/39424609239.pdfIn PDF document text
    • https://egf.tw/test2/images/file/jumezuwe.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/kuwug.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/takumasifejejete.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vuxutejebelopimugixepuji.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/46450659899.pdfIn PDF document text
    • http://shesob.com/file/files/zuregimanewumezageneni.pdfIn PDF document text
    • http://dentistturkey.com/image/files/geginixafurusalunuka.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/42964733293.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/depitape.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/94686289063.pdfIn PDF document text
    • https://anup.bo/images/files/regonepidededizejirus.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c103d4094d---fatotidevadenebabazuride.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/tukizusunomusugeponen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+app+store+optimizationPDF 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_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 17228 bytes
SHA-256: 79b031c6ad8181b3501939fdca2cb8a17aa1366a470343ef688d479cce5e5aeb
font_01_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 10480 bytes
SHA-256: efcce3bfc67f4268f05846039908d14bbaa43d9b334306db804d69b322abd673
font_02_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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