Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c7289eba8c56af…

MALICIOUS

PDF

93.0 KB Created: 2021-09-09 12:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9549221a545974b9406233a635e1dfc4 SHA-1: ff060a545665e7408b6e33283cb9f20d4a2986c2 SHA-256: 11c7289eba8c56af3f0e8bfb1865a5953c613077a953a2bc22423e7333692c0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many distinct, low-reputation hosts to distribute content, likely to evade detection and maximize reach. No scripts were extracted, but the PDF structure itself is designed to present external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=sarah+parish+doctor+who
    • http://vaonhaphatphap.com/images/uploads/files/49969055992.pdf
    • http://rogersdesignhouse.com/uploads/files/towikuwibu.pdf
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11392552724.pdf
    • https://kalashad.com/userfiles/file/46983871789.pdf
    • http://keramann.ru/uploads/files/linidafinexutisibu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a8bf1973e---57822979200.pdf
    • http://medeeatour.ro/mm/file/2266229761.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/godumixorimozipufik.pdf
    • https://hahapediatric.com/uploads/files/202108311935301335.pdf
    • http://suphammamnon.org/uploads/files/18536303819.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/wejudoverudita.pdf
    • http://maysoi.com/hinhanh_fckeditor/file/14290073353.pdf
    • http://qiangka.com/ckfinder/userfiles/files/vuwevotidutenemafebowedox.pdf
    • http://alburigiott.it/userfiles/files/78418893117.pdf
    • http://cuspsurgeons.com/userfiles/file/37013246233.pdf
    • https://adci.vn/data/upload/file/kigoposobixok.pdf
    • https://southwestlooms.com/admin/userfiles/files/21294430263.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206e62596---lukorurururaselidutat.pdf
    • https://armenia4d.com/contents/files/95926786680.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/40568340328.pdf
    • https://bunianco.com/other_files/File/26022234110.pdf
    • https://wedding-photos.cz/userfiles/file/34941226816.pdf
    • http://mnwebdesign.dk/userfiles/file/60427992188.pdf
    • https://chowdhurytourism.com/ckfinder/userfiles/files/judujigajenoviseligafi.pdf
    • https://whitesal.com/data/images/file/6800_20210909122809.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_off00010318.bin
cff314133dbf25f4864a54c635f408f657a3acc11b79b692c82f68da8c1424c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 10492 bytes
font_01_sfnt_off00011b18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 16792 bytes
font_02_sfnt_off0001332a.bin
0e7b3ef207f0cfb71e5e14f3e4ff2380dcdc2fcff2e030183b9ecfd19167709c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 19556 bytes

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