Malicious PDF — malware analysis report

Static analysis result for SHA-256 8478531608589b79…

MALICIOUS

PDF

86.5 KB Created: 2021-09-21 07:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b86e1a72c7eac7abd27b1a089e94326a SHA-1: 582e2a5d476f61602f7c05f7dd945250b0d88afd SHA-256: 8478531608589b79fe49c1b3a27c905801b063097a43fdb96074e49ae4deaabf
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to various domains, which are characteristic of a link farm designed to obscure the ultimate destination and evade detection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, suggesting the document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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 http://parbatsamajjapan.com/img/files/files/tudewedupezuwiraxuzadeken.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/35212804630.pdf
    • http://kapsalonvogue.nl/files/file/63373714545.pdf
    • https://myclubowners.com/userfiles/files/3674460291.pdf
    • http://danchrisjewelry.com/userfiles/file/fujabinofenijuzusoxulesuw.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24435669221.pdf
    • http://homokkepek.hu/editor_up/96506902621.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mevesevotenopaxuma.pdf
    • https://aristi-trap.com/upload/users/files/segudunavatigosi.pdf
    • https://searchlink.org/userfiles/file/35666820077.pdf
    • http://blbr365.com/userfiles/file/1631707278.pdf
    • https://12tiga.com/contents/files/mavolijos.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135088586781---91687162047.pdf
    • https://maintogelonline.bet/contents/files/37141316190.pdf
    • http://autosoftware.company/autoresponders_images/files/wuwewokupega.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379a24ca4da---27751001845.pdf
    • http://bettynblue.com/upload/fck_img/20210912/file/75425236213.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/68657915819.pdf
    • http://matsusushionline.com/uploads/files/87423392346.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/1931053953.pdf
    • https://copab.tn/216mag.svn/uploads/files/57009089019.pdf
    • http://stphilomenaonline.org/userfiles/file/19919045513.pdf
    • http://uralcomservis.ru/crn_fls/crn_files/lujadurafigijisofexanokej.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/64104199081.pdf
    • http://jamxmpharmatech.com/upload/files/mumonuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+share+text
    • 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_off0000ed55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16792 bytes
font_01_sfnt_off0001056c.bin
4a831d981da1930de43923a0051d588ce5230696e8c64cf019618eebc18ae782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 10384 bytes
font_02_sfnt_off00011ce2.bin
5c77f6f085b2b9428d0b9ccc846b6e6a6ea0c5190ab04d55cba7e35ef12c312b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 18080 bytes

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