Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e25353f02016d34…

MALICIOUS

PDF

86.5 KB Created: 2021-09-09 06:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0a537da5336f8119d557c6041951f4f SHA-1: 5231ef2d81bcfc95ec3a4ecd1cd8ec90e831ac29 SHA-256: 3e25353f02016d34a5060eeea44f99e0d6344e54160cdc90d847431795342b6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through these links. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • 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://securitydm.com/slicice/file/46090941563.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d3374688---fitudaruluv.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/viwubi.pdfIn PDF document text
    • https://e-midas.ro/files/file/majeregewakovenezeg.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/8960019443.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/15388067488.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/letuwoxajoxawonidajepoj.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/33881862825.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/37319894758.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/topitafuzajowo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/39132402428.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2974ae7931a9d5dab0a5e5807dfb3f0a/54620141728.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/63407606850.pdfIn PDF document text
    • http://salkim.com/userfiles/file/kipizopenubekusirikamig.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/95594952617.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/19496867950.pdfIn PDF document text
    • http://alkanboya.com/files/file///xadolebagalasarorir.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210907_23ADE1453057E887.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/17479697958.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/11574250232.pdfIn PDF document text
    • http://jfe.hk/userfiles/77892823116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=thoptv+app+official+websitePDF 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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 18116 bytes
SHA-256: ea3ef2942aba8517f99723a0aed3734289e6b7794b44c07cc1a6b764ab08db43
font_01_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13425 10628 bytes
SHA-256: 067ae50ff388442c6058c413419409199ef0691d5fa5d216f76abb7d92bd2800

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