Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59b8d145f3c3ef8…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 20:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd214fb2f75ba810372ef7dc6f87b76d SHA-1: 7f0c3b974cb2d3f33d5bf318634873d2e95691f8 SHA-256: e59b8d145f3c3ef83934f98a4794e4fc4465b36585258014fc5649aafe509d48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute malware or conduct phishing attacks. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://wastran.ru/uplcv?utm_term=windows+7+ultimate+64+iso
    • http://asja.ua/userfiles/file/67667932321.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/dexutukiwegu.pdf
    • http://bsbcarpet.com/userfiles/file/71263355782.pdf
    • http://dglytbt.com/upfolder/e/files/20210903080506.pdf
    • http://esipro.fr/userfiles/file/jatapifokidebajezuwedowi.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142f8d4b0f5d---40334013482.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zugefusetar.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/50672291580.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/36712230537.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/97932907700.pdf
    • http://myrbacken.se/login/ckfinder/userfiles/files/toxerakenep.pdf
    • https://carolinevlieghe.fr/images/file/74191028376.pdf
    • http://www.taxivanclass.com/uploads/ckfinder/files/zeweta.pdf
    • http://balbu.eu/uploads/news/file/76368024027.pdf
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/monaduxev.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210907160420.pdf
    • http://studiodebiaggi.eu/userfiles/files/71984033454.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/dexaxid.pdf
    • http://wedding-box100.com/uploads/files/202109011016309716.pdf
    • https://998.geektic.com/geektic/files/34941725188.pdf
    • https://trsoftyazilim.com/genelresimler/file/dubazusitenobaxubuzixax.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/43949627317.pdf
    • https://alariel.be/userfiles/file/waniji.pdf
    • http://ilkyoukais.com/Images/Media/files/lipejaduvukurepifaro.pdf
    • http://lulanjina.net/upload/files/pitijamubi.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd7fe3c41---66651904477.pdf
    • https://vhcvietnam.vn/ckeditor/images/files/zerizoveka.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_off0000eb55.bin
86907497b0fe60312eaad3d779fd1b04acde3016bc5e4dbe27b4fc7370f8b232		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 10784 bytes
font_01_sfnt_off00010454.bin
bc5c9b7cf6dcd3a5b454aea3087162fa76b869727cceefc979d2233ae686b21f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 18120 bytes
font_02_sfnt_off00013312.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13312 16792 bytes

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