Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed60c2bd0767898…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 11:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c873f7e46610aa5e6751463ab8c3c1aa SHA-1: 43b40adba36eaa2cc417ab40725f5fa15ed2170c SHA-256: bed60c2bd07678983caff03c59ec178e9e4580b51faf33d64b340df2ed9c9bad
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 and appear to be part of 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 initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://catamma.ru/uplcv?utm_term=packet+disabler+pro
    • https://himalmanpower.com/ckfinder/userfiles/files/28067806868.pdf
    • https://opsclown.it/ckfinder/userfiles/files/61271025875.pdf
    • http://taxicityplus.ru/userfiles/file/49342914344.pdf
    • http://macautemple.com/userfiles/file/nefoze.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/13386818546.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/latin.pdf
    • https://nnkcreations.com/userfiles/file/46031272244.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/1965317007.pdf
    • http://heimundsicherheit.de/userfiles/file/jegutikomuzarix.pdf
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/62477229947.pdf
    • https://ourlady-schools2.com/userfiles/files/6223584836.pdf
    • https://jobtiara.com/files/files/53836363217.pdf
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/rabilafegomufedewo.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161373b912d498---13373001634.pdf
    • http://digitalpolicycouncil.com/imagenes/file/20087901214.pdf
    • http://elai.kz/upload/2021/09files/2109240248158741640da0c.pdf
    • http://boonfagrandhome.com/user_img/files/52397533459.pdf
    • http://toonesk.com/upload/11703327851.pdf
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/bugodukapumoxutedesop.pdf
    • http://phuongdonggolf.vn/app/webroot/uploads/files/15996254982.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/82814762393.pdf
    • http://dreambeauty.kr/upload/fckeditor/file/jevedasip.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/waroru.pdf
    • http://slkuang.com/v15/Upload/file/2021919846576113.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3231d209---muvajaronomi.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/pujowokalefebibososibul.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_off0000b471.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB471 16792 bytes
font_01_sfnt_off0000cc83.bin
aea0dec6828ecf87d9c43013f7cb4367b0c9af547a07e2afec1c1d755c9f280b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 14452 bytes
font_02_sfnt_off0000f0d2.bin
24550dfb7b4d49471982b0acd9b27b37bfef68b113c0b3a8835ae70b4313a1b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 10636 bytes

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