Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd96a0c98b519e2e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 18:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3480690be950670fcb044deae536899 SHA-1: 16f5f7a10eee4af58702833da7bc92039af71d33 SHA-256: cd96a0c98b519e2e0dec6e45cf8f6097db99d6c4b136bd59630b190f75b8bca3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://greatwalledmond.com/ckfinder/userfiles/files/63635973273.pdf
    • https://totalsewa.com/userfiles/file/bulopasokatevejuxav.pdf
    • http://domainecomps.com/documents/files/76557851300.pdf
    • https://cargotavio.ru/files/file/tarirakotexirigaz.pdf
    • https://blueparadise.pl/userfiles/file/jenojil.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/rodejelazamagukozu.pdf
    • http://police8coop.com/UserFiles/file/reloli.pdf
    • http://wsm.hk/images/files/72748798251.pdf
    • http://christ-china.com/filespath/files/20210909081618.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/papuwinikilizebezatenil.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/xaparikabirodadufikomedo.pdf
    • http://foto-preiss.at/upload_files/files/purogapaguku.pdf
    • https://cs168.tw/upfiles/editor/files/50883735251.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/75794581208.pdf
    • https://kueapem.com/contents/files/lazopu.pdf
    • https://tybistanbul.org/resimler/files/15125384444.pdf
    • http://michalpavlicek.com/uploaded/file/63930171513.pdf
    • http://phuongsen.com/img-chamthi/files/96867865658.pdf
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/jipurenebupulus.pdf
    • https://pacientes.quiroser.com/UserFilesQUI/file/46341987193.pdf
    • http://finance-bulldog.cz/UserFiles/File/67293932572.pdf
    • http://koala-al.com/d/files/judumevowebulo.pdf
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/72229549000.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=battle+royal+ios
    • 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_off0000d5db.bin
832a8690b7ee2d3453285f4a18bd518faba2d8e67207598cb595f207b52c75fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 10164 bytes
font_01_sfnt_off0000ecce.bin
3923d57217c56124db8de2b8d01cbe442462d0b87c336abe75e8a11e18cae362		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 17632 bytes
font_02_sfnt_off00011a4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 16792 bytes

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