Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d420c31ab9d09d2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 01:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a08c1a2bfa752f7d976ae3efdbed640 SHA-1: 7485645793a6552419d684e3c2d55b90e324e5ca SHA-256: 6d420c31ab9d09d28461216b4e8181959dc4d213150c5685ce84533d55fa20c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious intent by using many disposable domains. The ML classifier and ClamAV detection strongly indicate malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=mumbai+saga+movie+watch+online+free PDF link annotation
    • https://alohasafaris.com/files/21148416645.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/35008525995.pdfIn PDF document text
    • https://j26clean.com/upload/files/495737690.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/posabaparudalep.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/buvezurixegebutuvusuk.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/28674689876.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f60ee59f82a006cf0dd6f024db9c54ce/51107283428.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/3741193483.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/82602159164.pdfIn PDF document text
    • https://etadelloro.it/images/file/83102823167.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/95427056480.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/16083719906.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/38559151564.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/wofuzoxiledijozuvod.pdfIn PDF document text
    • https://ibextrail.com/editor-images/daxowikave.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/nebunevalopifixakajaw.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/lokupenebebe.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/bozarababijufijog.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/bumixowe.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/65067948196.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/milababeku.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8aaf8a597---96503036135.pdfIn PDF document text
    • http://gestioniarmatoriali.it/puseg.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/80912823590.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/pusukipomutob.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_off0000b958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB958 11168 bytes
SHA-256: fd64089badf20f6e4a5112d95203fa10a8d3d07a4b10db0013730255f25bbbf9
font_01_sfnt_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 16664 bytes
SHA-256: 0ed76853849ef7cc5e9761ff512a5d239a6bc6a08173fa65099454799c399aa4