Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf2ed40a1fa43a5…

MALICIOUS

PDF

82.7 KB Created: 2021-10-05 04:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b68b99ddd047c0471406fd02f05bf77 SHA-1: 8c88d9c6cbbf0001815ce92e87fc6ad40d1ff0f5 SHA-256: 7cf2ed40a1fa43a5227ef8e278d5040bf47df0612fa157757645efd1bfa980cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple external URLs, with one specifically crafted to appear as a download link for PDF conversion software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites.

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://crewmak.ru/uplcv?utm_term=software+for+pdf+to+word+converter+free+download+full+version
    • https://radio-clipa.ro/userfiles/file/nejodegosavanifadomago.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161334ebc161bc---77834998719.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/xokug.pdf
    • https://larrialdiak.es/files/galeria/files/mofajag.pdf
    • http://iglozawiercie.pl/zdjecia/file/desax.pdf
    • http://ks-system.co.uk/ckfinder/userfiles/files/94761106746.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c0048457124a8e71a030da6bd5ad64c/46281851998.pdf
    • http://energosol.pl/images_cms/file/lidovutojor.pdf
    • http://cybernet-ap.com/UserFiles/File/lazevo.pdf
    • https://dp-engineers.com/admin/userfiles/file/98542973270.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/5052697002.pdf
    • https://ce-mi.pl/uploads/userfiles/files/90101693551.pdf
    • http://sushimura1.com/uploads/files/57922020395.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/gazoluwagojamuwafimowib.pdf
    • https://bouveau-consulting.com/userfiles/file/93615318797.pdf
    • http://bebelino.ru/userfiles/file/99515302479.pdf
    • http://peak-experience-japan.com/images/blog/file/gison.pdf
    • https://livre-art.com/ckfinder/userfiles/files/16116464885.pdf
    • http://sonarkella.com/userfiles/file/lowevipujodezevag.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_off0000db5a.bin
caddf9f4057544507c073b70bc7ea6881d7b8c5b089a425c84620381d60918df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 10940 bytes
font_01_sfnt_off0000f4e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 16792 bytes
font_02_sfnt_off00010cf9.bin
3c9d2c226cc879ae4bae08ad3367a4a74e7c7ff6998badebcf6e43048d18d950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 18112 bytes

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