Malicious PDF — malware analysis report

Static analysis result for SHA-256 26025d7d38c30f5c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 07:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cddd30fb2c8040577a615aa1d1fbd6cd SHA-1: e800ba8178e0a3719b108475751547741867882f SHA-256: 26025d7d38c30f5ce87d464e0bbdd58d37a98a0c74ce9450e4b8511dbd5ec63c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified numerous external URIs and a link farm on disposable hosting, suggesting the PDF's primary purpose is to redirect users to potentially harmful websites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=estructura+socioeconomica+de+mexico+guillermina+baena+paz+pdf PDF link annotation
    • http://matsusushionline.com/uploads/files/27429063619.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/tuxorutevekituf.pdfIn PDF document text
    • https://laser123.com/geektic/files/48674898824.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c35790a0ca---77980633362.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/visuvubudegi.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/vozunatetuvuvukinix.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16149561930f15---riraxotoropagi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/3024340804.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/65895784447.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/73090576028.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9db006d4---58899742749.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kifazifovuxosoxatajanaxew.pdfIn PDF document text
    • https://webmenuplus.com/images/file/60539544766.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/gudexupawofotilivaruriwuw.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/nedox.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/26953679867.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/44460280440.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/muvasufajerefupaj.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/73165748232.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/xikabaf.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_off0000b5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B1 17440 bytes
SHA-256: 1f864d8e77b9ad8b20d6ee9d3ffdff659ba2d7b6c52129ca5634d30fc9097b39
font_01_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 11348 bytes
SHA-256: 098da8688f34121e90aa7543eff297ea744af3cb8e433960f3968f27a8d0e98d

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