Malicious PDF — malware analysis report

Static analysis result for SHA-256 82665961d7e09e55…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 15:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e937e6670788f854d10bab9ad3aebcb0 SHA-1: dd7fb21fb1204366428f9bd2af0b95f68ac6643b SHA-256: 82665961d7e09e5577a23f337d150fc7acf9a4821c642099c1b38fec2a8b5d57
174 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it's a social engineering lure, specifically a browser extension/update installation scam. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the numerous external URLs, such as http://ecoaga.com/documentos/file/dameli.pdf.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ecoaga.com/documentos/file/dameli.pdf In PDF document text
    • http://cz-synergy.cz/data/file/nozinisezizi.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/95175193712.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9n3ags3p6ghjatotou6u62dc4c/39077427901.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/ragafasula.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210911141111.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/6176376872.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/jusetibidukumebiliti.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/xudagezovoke.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wunamu.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/gojigolotupolatoni.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/40040248030.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/67526925432.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/segevumifumekivefibigugew.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/siwumivo.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/56348884631.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/9942054430.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/dasizosulugulonij.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/11936796880.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nazepawimolutemowi.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/jaresixido.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/bazoforol.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/57909712251.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9081e6h1mb1btv7mdmv8ca2cds/rezexasivaduzuligox.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/83186791901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+download+latest+chrome+for+windows+10PDF 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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 17316 bytes
SHA-256: 494d5bf6ee43cac6917d9cf445bccba99d4226bddc77d5828a719184f956a842
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 10980 bytes
SHA-256: 1b861c43c5614ab083fdf3142e6c2da3a2867d13742e33a26ff94346d50e2cdf

Open this report in the interactive analyzer, or submit your own file for analysis.