Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdcc41a99c3946f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 11:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c303b61200d37357cae8abe55d7734b SHA-1: 4918a7284686aae7d000d0a12da664d24c02f9b8 SHA-256: 9fdcc41a99c3946f9f730ce98477e4000eb72c000920deb22b1fa86f0d406ffa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://rmduncanrealty.com/userfiles/files/85897478538.pdf
    • https://thisissati.com/userfiles/files/rasanunowasuzutipujira.pdf
    • http://steakpluspizza.us/userfiles/file/50296522973.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fikifusogenozefegakex.pdf
    • http://2ds-creations.fr/userfiles/file/37535896889.pdf
    • http://webs123.com/userfiles/file/monox.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/gamamujejanazotunitisiwo.pdf
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/20963048009.pdf
    • https://shopexpert.com/app/webroot/files/userfiles/files/11036550856.pdf
    • http://talleresjpg.es/img/file/92342791811.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/26433338265.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/jefenumir.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/67918468503.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94b6e93ec---vofirikapidizas.pdf
    • http://ramenhajimetustin.com/uploads/files/4883007999.pdf
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/57640066992.pdf
    • https://doitoutdoorz.com/file/GJ4iaKSpQhvhngJm.pdf
    • http://nagakuratrading.com/js/upload/files/sumawilekus.pdf
    • http://uniradioweb.info/userfiles/file/65697502339.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/55822552576.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/51442732141.pdf
    • https://peintures-descours.fr/fichier/files/meradexeguzakonip.pdf
    • http://tareeapartment.com/user_img/files/34683754089.pdf
    • https://tarsiman.ee/files/file/xisizigulogofowosif.pdf
    • http://shophouse.info/images/files/vexomosopawajakeberi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+record+screen+on+cell+phone
    • 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_off0000e828.bin
b2eafef28c3140587836409c3604f2055f0b43296e0569f4c0d40bade750ec26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 10432 bytes
font_01_sfnt_off0000ffc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 16792 bytes
font_02_sfnt_off000117d4.bin
4183f27985c117e5e3158b90ec6b2f8a1fb26ac8f0993f16f1123e3fcdd68fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 18004 bytes

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