Malicious PDF — malware analysis report

Static analysis result for SHA-256 9005cc709b8fb65e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 01:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bcb9728500b1f06c65138c8382d84bb SHA-1: 4cc93c7520a2d2884c0f46fe4694df3587008137 SHA-256: 9005cc709b8fb65e71e01fa13740347b20c6f8aa6da2b2ece491dbb53b5bfed0
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 on disposable or unknown 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 0.9978

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://biroestarsa.hu/uploads/file/13833898287.pdf
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/gutaxokejatari.pdf
    • http://cupta.org/userfiles/files/20210924220229.pdf
    • http://interel-rus.ru/test/sites/default/files/file/rebejabiba.pdf
    • http://guidesdugrandlarge.fr/images/import/file/kutadonaxufudur.pdf
    • https://fuoriscena.eu/file/xesizelebozogixe.pdf
    • https://hondamienbac.vn/userfiles/file/84502099721.pdf
    • https://markaoyun.com/calisma2/files/uploads/6311433755.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/jefudenoromadoxazuxa.pdf
    • https://lentes123.com/aym_image/files/sagobusimanusa.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16149344630fda---97705576190.pdf
    • https://edusfera.pl/upload/file/serumutoba.pdf
    • http://pokemom2.com/uploads/files/80929954514.pdf
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/mewesuzexafuduwapofafo.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/78916524224.pdf
    • http://pazzo.jp/js/upload/files/bagolazise.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210916202349.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210906230600.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/faponomutukebaf.pdf
    • http://www.f2dassociates.com/userfiles/file/saganilononifikofoj.pdf
    • https://shreenatharcade.com/userfiles/file/89518907953.pdf
    • http://hk888.edo2008.com/com/comimg/file/20210911_153759_127.pdf
    • http://volkshilfe-vlbg.at/images/content/files/diwofukuragakab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+tamil+movies+online+free+streaming
    • 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_off0000b1c4.bin
efdef7beeb8c215a4897492865e2b20f1945b0cab44b927735e420d2d7719e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 15296 bytes
font_01_sfnt_off0000d8a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 16792 bytes
font_02_sfnt_off0000f0be.bin
c53d855fa2cf3ed59967bd96a5857d087595b635dc58744da5a547846736a479		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 10844 bytes

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