Malicious PDF — malware analysis report

Static analysis result for SHA-256 50292ace3f5805b5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 05:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 463840ea10c2fa904a8bbdc2710bf85d SHA-1: 80c6145de735f0f8ae0bcd572d60a1e482892ffe SHA-256: 50292ace3f5805b5a7713dbbb7a18a99916318ba782318ed2182a615f9e393eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=joy+of+creation+story+mode+apk
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/zodonawidit.pdf
    • http://magooferta.pl/uploads/fck/file/80121422357.pdf
    • https://www.karelo.com/uploads/File/pobagesizazipog.pdf
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/64957474797.pdf
    • http://zagazzo.com/userfiles/file/pilitamanowasavokawos.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb785227a---nixavexaxoladenaxej.pdf
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/kololibotalufubidexutuxar.pdf
    • http://epoch-making.jp/js/upload/files/maperemawutabexejuwop.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/jarelirosinez.pdf
    • http://girlstown.org/files/js/ckfinder/userfiles/files/55147119803.pdf
    • http://beming.com/ressource/site-image/files/taxaviwigezanulerofevaf.pdf
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/68006135250.pdf
    • http://cansuyu.org/resimler/files/64723439328.pdf
    • https://vietrocknet.org/app/webroot/img/files/rowoluzir.pdf
    • https://conexkarvan.com/cache/fck_files/file/nikoralimas.pdf
    • http://belst.by/upload/file/bamojimoduvinosakonogemib.pdf
    • https://serviceservice.eu/userfiles/file/71648650287.pdf
    • http://terminsk.by/pics/files/rogelatevatikigobexomal.pdf
    • http://finalbrand.cz/upload/file/85808430041.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142e83adad9a---65480092373.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_off0000d59e.bin
1a1f9d827f20dd7685e3b13d799f8fad94ea5f0e926170257ebcc5ac66e85438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 10932 bytes
font_01_sfnt_off0000ef00.bin
47abbca6225f50548be1c894ae2673bc90f1bde70af82c2d8889c9063a27c6cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 17424 bytes
font_02_sfnt_off00011c72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 16792 bytes

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