Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19594338ca058a2…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 04:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38bafa94b4c73e8a68da3bdcebe745ee SHA-1: f51aabb797d0eb1865a8d9225b94221d18d75fcb SHA-256: e19594338ca058a2cbc70ecc7b13beeeef7e5f348120b5c75f605b18cb5a1628
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript could be used to further obfuscate the download or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613562e39a97e---37998749355.pdf In PDF document text
    • https://sealand-pptc.com/userfiles/file/55271678190.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/dogunupubajif.pdfIn PDF document text
    • http://apismorava.eu/docs/24847392752.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/bobefipawozosedivetuzit.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/92473642136.pdfIn PDF document text
    • http://tulga.ru/editor/files/35415036935.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/58888223721.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/bd74d4f5e67eb150ca9b132610766ca1/xevupupewepetijevedofebi.pdfIn PDF document text
    • https://guijek.com/userfiles/file/93843276044.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/xivigadivinerusagifa.pdfIn PDF document text
    • http://effekt-film.de/files/file/wabolaz.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/87390860636.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/leniguwexebovofa.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/rakamizasuduvarevanol.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/tubabe.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/87995474804.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/gokidobaluneboveza.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/10341914556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hola+ad+blocker+chrome+extensionPDF 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_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 10960 bytes
SHA-256: 18e286f74ef2719de78c36ea7d45548a4fa135d14fa9e53fbdf22637083fd38c
font_01_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 17916 bytes
SHA-256: c4afdbcdb76007583be0630ca8f1c6fdd8dfc0d6310d3a7008cc82ce818a5deb

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