Malicious PDF — malware analysis report

Static analysis result for SHA-256 098b72e33e98f861…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 09:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efd31bbbe60268ffd1969fac4ad56ab2 SHA-1: 2152ad80b47ea3c909fcc8d3e63d1e7781b9c91d SHA-256: 098b72e33e98f86192970ca0a5f6fb54f738349a2213fcb58c37ca5c324c3c13
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the ML_NYX_PDF_MALICIOUS classification strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=videoder+pc+software+download
    • http://zopos.zohukum.com/ckfinder/userfiles/files/voluvavofazonuveda.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b272ad0efb---22839273973.pdf
    • https://eclearusa.com/images/file/diwemagavijofaz.pdf
    • http://pbpharm.com/upload/files/dukebededowalabukika.pdf
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/45904385645.pdf
    • http://ttlh.vn/storage/ckfinder/files/dizowosilejem.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/51423057327.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/xewuzilokos.pdf
    • https://ecohort.com/userfiles/files/79024221487.pdf
    • https://vibanghanoi.com/uploads/files/37437807361.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/91338414251.pdf
    • http://sanarina.de/ckfinder/userfiles/files/43249672335.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/pinowobewikivososilepo.pdf
    • https://et-auditing.com/userfiles/files/98752167948.pdf
    • http://sakurahoaanhdao.com/webroot/img/files/sadetowibebanufunojar.pdf
    • http://okun.su/upload/file/49529038208.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210914_BCBA15F0329977C0.pdf
    • http://skene.es/userfiles/file/8417360405.pdf
    • http://www.ondebiz.com/userfiles/file/95709332861.pdf
    • https://red-adlay.com/upload/files/29312203349.pdf
    • https://client-sms.com/ckfinder/userfiles/files/38798055789.pdf
    • http://bjjiffy.com/upload/veruxekulinewidunizisomiz.pdf
    • http://sadiqandsons.com/userfiles/files/84345136951.pdf
    • http://manegedebuitenwijck.nl/uploads/file/67397065096.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 16792 bytes
font_01_sfnt_off0000e5f1.bin
188ed9aae2a8c66386d871d9e4d21e9a299a4bd734ac4eb3842a8e27e7134a41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 10668 bytes
font_02_sfnt_off0000fe8d.bin
82052f4afb1039ab3a4ca4629d1293201743535ec44c056294144f606d36c73a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 17532 bytes

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