Malicious PDF — malware analysis report

Static analysis result for SHA-256 556640f3a030a863…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 03:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a724b6031858fba4c42b02ef66a0935 SHA-1: 8810e980b9a671d14af1abf95a214718c57b51da SHA-256: 556640f3a030a8639cc505e7f5dba1d81c74db4ae418205fe9e18a0942727b30
134 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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=marathi+font+style+download+for+android+mobile PDF link annotation
    • http://moscowballet.ru/userfiles/file/16547633507.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/zukufa.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/43340283998.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fegapezazug.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/85154886132.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/xewifupepilaxadanif.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/26686998296.pdfIn PDF document text
    • http://ukrfirework.com/images/file/94618915910.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/mivizonarotusom.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3b8a12d39---95094233972.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wutunega.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/25333832437.pdfIn PDF document text
    • http://islandpointfl.com/userimages/85110917038.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dopubabavi.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/mosigobanuledovu.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/kogitapurepedagalopokugof.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/94664719310.pdfIn PDF document text
    • https://ww170001.linebot.net/upfile/files/20210924080721.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/sexupanedujamopujizulaj.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/rojufevapusugod.pdfIn PDF document text
    • http://gyliver.ru/files/files/jenudizoriwuguvuzapu.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/13158a0a2e513c320f8c4ad202c72a72/dituxumulizisuv.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/92971374354.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 20072 bytes
SHA-256: fc48d9d7fd5b18fbf1ce4d61ce653001f257ee72039ce4d7dee6d9cb40ce1bdb
font_02_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 10952 bytes
SHA-256: b5b881b5ddb02bfecc7f1a427af2333ed49e7ea008fec56818ae5382decd542c