Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee47b2fc245b4f86…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 21:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37198fe8545eed428d0071a31f4c6964 SHA-1: cfaa7d3167522d4f07b0687168700e887e4e10fb SHA-256: ee47b2fc245b4f86b5d65307ac5dcfe650fa50df61f659ec6bd204ed480394b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

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://xn--j1aii.su/userfiles/file/felirifegutefejigog.pdf
    • https://makanbanyak.net/contents/files/5806409829.pdf
    • http://safaraval.com/basefile/safaravalcom/files/94266099744.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d0ac4699---4874595900.pdf
    • https://reklama71.ru/upload_picture/63726580982.pdf
    • http://thegoshow.net/userfiles/file/88215833509.pdf
    • http://firewheels.pe/userfiles/file/9507376396.pdf
    • http://lynxauto.ru/userfiles/file/17134425335.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/xufosuvukusuleletab.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/lomogolepavevamalepenegos.pdf
    • http://thekreativecompany.com/uploaded_files/userfiles/files/14871041294.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/vukagugaboged.pdf
    • http://gartenbaukoeln.de/uploads/files/16110539612.pdf
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/goful.pdf
    • https://mannoorpally.com/uploads/file/60037823068.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4af13d193278135e709a300ff89c932/97829556836.pdf
    • http://klawiatury-foliowe.pl/_data/file/85393041446.pdf
    • http://saxonrt.hu/img/userfiles/files/devogeguzomifisejujapoku.pdf
    • http://hanhthien.net/uploads/file/boduzilejekalofewotulak.pdf
    • https://laetitiabernard.fr/images/file/xebewotupip.pdf
    • http://nofatrans-int.com/userfiles/file/renededupufipoxitosured.pdf
    • https://actaviaserica.org/board/file/files/buboninakijaluvovilijov.pdf
    • http://lungshingcentre.com/userfiles/dizozugefabopu.pdf
    • http://gysanya.com/upload/file/210912181035096396lzddnujhzlvc.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=friends+4+season+watch+online
    • 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_off0000c7dc.bin
63ace8e983bbc5bbcdd338b7fdcabd98806dfed88f35efd526077b7b94eaa2b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 10608 bytes
font_01_sfnt_off0000e01b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 16792 bytes
font_02_sfnt_off0000f82d.bin
1f0d8ac0e81bc58ba11bd98b61248a75800b40adb84969bdd798fdc7c5ca05ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 17844 bytes

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