Malicious PDF — malware analysis report

Static analysis result for SHA-256 597d845c5c94a867…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 00:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25e6ff30edbdcba5d276d8e1ee0e9cd2 SHA-1: f67ddd19b896f16382ae5afed59e1ecbd824a6da SHA-256: 597d845c5c94a867ec5f5f5ceb12e9703224034f3d03c50b79fcbc8f6b7ba34e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=best+live+anime+wallpaper+for+android PDF link annotation
    • https://stealthwindow.tw/uploads/files/202109080521529663.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/1456719374.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/28683070808.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/xorabalijupa.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/meluteligefafafu.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/nuwikoselu.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/xelinobufurefuv.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/josafesaguruwopujofemaded.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/pilukasubodibiwagimijino.pdfIn PDF document text
    • https://digireg.ru/upload/suguxakedusakoxubatewodaj.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/84586176670.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/nanopuvu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/477hgi8rv0s9h2gb7q5besc4u5/89934071873.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/48862815693.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/66503766281.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/dibipopuxatotaxexeruwalir.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/81173913036.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/7976099676.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/muzenujutowajadejef.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/44271017548.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/89075652327.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/sedafufeziperudexaxaba.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/11854615688.pdfIn PDF document text
    • 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_off0000d449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD449 10864 bytes
SHA-256: f02615494fb2f4dfc4eec17d0fdcf5f1089ecc06b6f2384e6c1f8cd90c4efcf1
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 17028 bytes
SHA-256: 285d06cd7ff0d95b883b3671c8d6ed4a2fcb77ea97436308b5b3236741ea5050
font_02_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1