Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c93cf935b33f0fc…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 07:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19f9dc579539bdbf7975a527ed50b29e SHA-1: 55c136f4a27cb8f2f4ccb3fc65edb855c592a69d SHA-256: 2c93cf935b33f0fce45d3916d7a4faf3384262f957062d18a60888e9add18692
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malicious content. While no scripts were directly extracted, the nature of the embedded URLs suggests a watering hole or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://alltechsro.cz/files/kudowi.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/72157036655.pdf
    • http://lexxyin.net/files/fckeditor/file/73434160687.pdf
    • http://francescofesta.it/userfiles/files/53510667720.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/tizapimelomafezatomemub.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/jofosigabogapez.pdf
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/wufurogaxezetuvikasa.pdf
    • http://scro.ru/pic/file/zefezajuxovubefav.pdf
    • http://esipro.fr/userfiles/file/besamedudakazik.pdf
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/13486989959.pdf
    • http://pileshoppen.dk/userfiles/file/dofuwojupudimas.pdf
    • http://kasaitogo.com/uploads/files/zigedakevewejibiwuwas.pdf
    • http://kkslavicin.cz/sites/default/files/file/21967103233.pdf
    • http://bdsps.org/slbdavbatala/userfiles/file/85208376777.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/49ad1654dfbf4c6d2415678190fc0c20/29609567691.pdf
    • https://ebmturonet.progess.com/userfiles/file/vipagoz.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0f91448dc---98258072549.pdf
    • https://escritacontabilidade.net/fotos/news/file/jigazubifojamuzesakazed.pdf
    • http://w-f-l.de/user_img/file/45030336917.pdf
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/69083062960.pdf
    • http://funkyspa.net/ckfinder/userfiles/files/toxelovununaziv.pdf
    • http://www.gabrielamaciel.net/images/content/file/26251146141.pdf
    • https://psfund.org/public/uploads/files/cms_files/61466349749.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=solvent+for+recrystallization
    • 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_off0000b3dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DD 16792 bytes
font_01_sfnt_off0000cbf4.bin
f18b5c8d9d4f30f2750bcbc3c5cb5c5a1db86656835b242a8365f6182b4046b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 10644 bytes
font_02_sfnt_off0000e483.bin
5860233ddb89eeeb8b3c7d540a9a4a81e0cebbd158030a573e6556df82c6375b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 18340 bytes

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