Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb2823a55a2e25f…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 20:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b81d8e9c0368eb09e8f281a7050c693a SHA-1: 4c8f1ad32a7a2c75c7acdcdaf07407865126bbce SHA-256: 1fb2823a55a2e25fe87f963461a7cee34e1b575ae5724636a3419e3062feefea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous unknown-reputation URLs found in the document, potentially for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hakanhurdacilik.com/userfiles/file/nufazikovodamuzeg.pdf
    • http://shimamura-mail-order.com/userfiles/file/40411287568.pdf
    • http://sithome.com/upfiles/file/20210907145552.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/83336050462.pdf
    • http://daisin1977.com/js/upload/files/37170885203.pdf
    • https://ph2020.org/FCKeditor/file/5351758550.pdf
    • http://855solution.com/htdocs/cljr/data/files/pazenekisuvakanokozalawav.pdf
    • http://alptw.com/images/files/gaxux.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360b1ad071a---rejemezikowe.pdf
    • http://bienchidan.org/uploads/files/44720130624.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/872748201.pdf
    • https://hotelharmika.com/assets/userfiles/files/kuvekikerufosowuzagoge.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/51743050563.pdf
    • http://s2ipower.com/survey/userfiles/files/6878111018.pdf
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/73702910758.pdf
    • http://pawsandtiaras.com/ckfinder/userfiles/files/37530957943.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7945d9a8f16c6c3f0ec5d62200a784d4/zaxefibokuxivurexel.pdf
    • http://plafondchauffant.fr/img/user/file/zokodunuguzobirum.pdf
    • http://zespolbahamas.pl/zdjecia/file/705934581.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/73768798021.pdf
    • http://fratellibeninca.com/images/file/xanopojozuvilugopogiguj.pdf
    • https://www.adom.biz.pl/ckfinder/userfiles/files/2422884002.pdf
    • http://mhzsolutionz.com/userfiles/file/darerofataxaxoxoxoxegi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+modelli+android
    • 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_off0000af9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9D 16792 bytes
font_01_sfnt_off0000c7af.bin
50a616c479d8247a98fad35ed7e023b87cba2493406bd875ff1b0d10d4db2ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AF 15516 bytes
font_02_sfnt_off0000ef66.bin
2e85cdf09ef0f5a9460355f4273c02240d8d1472a0e99e821e721f90928eac8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 10668 bytes

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