Malicious PDF — malware analysis report

Static analysis result for SHA-256 691362db3ba57819…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 13:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27b48b6ce26b9f23e7582b41e1d23a8d SHA-1: bd321af44e536be9d418516f6840f4c7d6574c74 SHA-256: 691362db3ba5781928854fa74578fd6855fa6081ad2e9c65f6bb48031c0649fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The PDF also includes numerous external URIs, many of which point to disposable domains and are likely part of a link farm designed to obscure the ultimate destination, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://onecre.com/images/content/files/gelidofesajorozerajigif.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c7e28ba1c---44818889739.pdf
    • http://thehbbq.com/uploads/files/jagepububukuponagewoxur.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/fabobibobupi.pdf
    • https://mvmdigital.gr/files/files/56157390319.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3d6fe9d29e25fe3f7bf45bcde78e7101/dufep.pdf
    • http://accessiblevehicleservices.com/userfiles/file/12662347795.pdf
    • http://eiffelflowersquesnel.com/userfiles/file/gutikirakizikoladovafu.pdf
    • https://topclassgreenery.nl/images/file/kejagudebolubose.pdf
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/viropeximasizafomili.pdf
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/48219059624.pdf
    • https://cottonweb.net/userfiles/file/19914227674.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/luditezonavidakemefelov.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/wubibisu.pdf
    • http://osstemcardiotec.com/files/fckeditor/file/724403538613356d187c8a.pdf
    • https://communeouchamps.fr/userfiles/file/fuxenir.pdf
    • http://kcntanduc.vn/img_duhoc/files/xakofatoxikigab.pdf
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/lozavotetubeb.pdf
    • https://asiantms.com/ckfinder/userfiles/files/9421681545.pdf
    • https://pharmnet.cz/ckfiles/files/files/39831366947.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/sumuneruxedodidezeregog.pdf
    • http://csc0451.com/userfiles/file/20210906094613_gsd8rc.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=life+beginner+student%27s+book+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_off0000d643.bin
a7c6ba4d8625991feebfba6e41c8465fcfbaeffc067ae0d9ed182ae06369a0c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 17880 bytes
font_01_sfnt_off0001042e.bin
e450f8243759328b41e4d92896e8bcc9171d10e263395fca867a224507182656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 10788 bytes
font_02_sfnt_off00011cc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes

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