Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c11bdcd8de1f2e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 06:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44f7cd287ef69a044a60932041ec2d58 SHA-1: 3d664c6235d18a4eae3db7658474011d14683277 SHA-256: 98c11bdcd8de1f2e9f7fcd26eeb98c17664b59275a233df9a4168a843744a047
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://newchat.xyz/js/ckfinder/userfiles/files/75490196049.pdf
    • http://arabic.cz/ckfinder/userfiles/files/vedimifikobavanipasukez.pdf
    • http://ebiocell.com/uploadfile/file///2021091706384269.pdf
    • https://flexi-cms.com/uploads/file/1628001704.pdf
    • http://leaguengn.com/userfiles/file///vikosewipuzowal.pdf
    • http://labotinnghia.com/img/files/mosijesuze.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2rosqmmff7u7pajtteoaguvi7n/gesefesedusuwi.pdf
    • http://zavalinka.by/var/upload/file/rulum.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xisenigesutenigi.pdf
    • http://akademibt.com/resimler/files/84957994849.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/mupizubuwerawumozozo.pdf
    • http://getwealthythisyear.com/ckfinder/userfiles/files/5890752978.pdf
    • http://cutyoursupport.com/userfiles/file/mowavinimezutakumoxu.pdf
    • https://motelandratecuci.ro/userfiles/file/selesisi.pdf
    • http://stepasidemedical.com/images/uploads/file/gidemusiruwolifuvudima.pdf
    • http://hykylalumni.org/userfiles/vubonagozasi.pdf
    • https://atputasbazes.lv/images/userfiles/files/mavoxapinizafazoj.pdf
    • http://manu-transport.com/documents/file/43323696710.pdf
    • http://stauarchitetti.eu/userfiles/files/babuwinipufuzibubagewidi.pdf
    • http://laclonghotel.vn/upload/files/vumizevila.pdf
    • http://helloslow.com/data/userfiles/files/dawarakoroxejodudel.pdf
    • https://ardiinerkh.mn/uploads/userfiles/files/fidokuneka.pdf
    • http://www.jasfec.com/imgs/uploads/67294460544.pdf
    • http://baigeleather.com/userfiles/file/jufalekikezikomejomaxe.pdf
    • https://gonguyenkhoi.vn/upload/files/69481987810.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+harry+potter+online+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_off0000b4e5.bin
ca8e496515542216f2e8db324ffc51e6881fed6ed0da86f16a12ac945b114ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 10928 bytes
font_01_sfnt_off0000ce15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE15 16792 bytes
font_02_sfnt_off0000e627.bin
20a3df32c7f077c0c42b422477a94819347cc7d7331bf34927abf4d897828570		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 15912 bytes

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