Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac656576084f22df…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 21:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64ac209aa863ba6fe065a0d338b455b3 SHA-1: 4ffe4dad71a0627e07528431faaffc3c352d92ec SHA-256: ac656576084f22df0ad02ac307b80d32b8e6afbfc8f214392963a5c2a7156e50
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI heuristic, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://naturalfurnish.com/userfiles/file/63505088892.pdf In PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/43814556817.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/pufodasibodovare.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/88535331750.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/90381987768.pdfIn PDF document text
    • https://eetravel.net/file/xevigosevebexuxavasefi.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/98922711873.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/54921852871.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/51921592901.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630631964.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/6812760013.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/texexokopuj.pdfIn PDF document text
    • http://zenithmetals.com/files/17620767771.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/67566294349.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/wesojivobeduzovaditofoxi.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/kipado.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/26985049904.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/37488808949.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4n5ngvncn1ij8rgmjk4smoj6gt/lupitesupox.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21e1ed471---32912369271.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/tizoturiwudowurojimol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=real+promo+codes+for+robuxPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/nubijalokumupoguvoxog.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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 18488 bytes
SHA-256: 6802796089381153b873cd0bdb5dd9b5dd3cdbe57a7aa3ab662fe38848f55855
font_01_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 10872 bytes
SHA-256: 9987555191889ff275c4032f0369b115d1c67dc8be228ce3c517c99a33ef92ee
font_02_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1