Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d4225a4863bc9a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-19 12:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8418edf8a4190d8881657f8f1ce650e8 SHA-1: 740a3619fd3d02d1d3bc305723e0d9f067e8e834 SHA-256: 65d4225a4863bc9abdc78d8205c0f59fbac4ff4bb352d11da5ac865c75626f92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sfasg.jp/js/ckfinder/userfiles/files/jozimun.pdf In PDF document text
    • http://daiichihousing.net/uploads/news_file/kogudojawukagazopelume.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/jaxatatejanejupata.pdfIn PDF document text
    • http://konberdbio.com/upload/files/gikasad.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/17933852761.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/gonow.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/46677187927.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a568f3b9---35768149027.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/zijiramodusadegeges.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/ganuvulozoramujezegizulu.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/zazedaguvugugoxedobo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/nonole.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/26415557654.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/bewerasoveguv.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/21728736961.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/dotazivagewamajabofofos.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/16993910649.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/39846337419.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/80486017055.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/40505875881.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/17152410510.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc9d59f79---88272848832.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/wemulukopejeviperamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+download+fifa+13+on+androidPDF 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_off0000b0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BE 14148 bytes
SHA-256: 654dacdd6f98c426077baab64ba352814f1b64cc4cd7c29e4d0d8625a2095b18
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 10348 bytes
SHA-256: 18098b0f1aeaa6c239ba2313c9fd0527d50c9d100c5e29ba9d9192e47b08e290