Malicious PDF — malware analysis report

Static analysis result for SHA-256 64541658eade53b3…

MALICIOUS

PDF

75.1 KB Created: 2021-09-12 04:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3d842bad4de08c6f1f4f16506e47f9a SHA-1: 7840bee1d2a8c3976650c7f782bd5fe29b44e135 SHA-256: 64541658eade53b3591644407ecee52f4d3ee65151860f97fb65b5f688d010c2
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 its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=skoog+instrumental+pdf
    • http://rymwid-training.com/userfiles/file/jogededobakofogugog.pdf
    • http://greenflameenergy.com/userfiles/file/5737338375.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4k2s3btnq0i2qsfenh7i21cd38/3349336745.pdf
    • http://apvn.info/userfiles/file/14962473112.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/16871934046.pdf
    • http://magicfood-cn.com/files/20210907084513.pdf
    • http://pataibicaj.hu/userfiles/file/xilusonowepufupesenijeda.pdf
    • http://grafichesirio.com/userfiles/files/pitix.pdf
    • http://tokyoracing.hu/userfiles/file/ximof.pdf
    • http://conservativista.com/js/ckfinder/userfiles/files/28025040142.pdf
    • https://mysmartedu.com/uploadimages/files/zoresitoxurudipuxi.pdf
    • http://dhf-china.com/d/files/24377151143.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161315f9f2865e---bavapurefuwamorazuwa.pdf
    • https://bimore.vn/webroot/img/files/takurajobajotudevi.pdf
    • http://sztarmedia.hu/_user/file/87703871528.pdf
    • http://braciszewska-klimek.pl/fck_files/file/33695048701.pdf
    • http://sahcarpets.com/userfiles/file/popojojawimutu.pdf
    • https://tspinstruments.com/cache/fck_files/file/25651312636.pdf
    • http://photopuzzle.net/userData/board/file/15518475966.pdf
    • https://canevastoilestjean.com/upload/editor/file/raxonawubinefup.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090221491580554.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136e05752de2---xemom.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/23978226799.pdf
    • http://citty.org/images/uploads/file/gagelu.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_off0000bf88.bin
4b85211cbfa9f09401d1fe707f161c547f0465894fcffb9a568920c13c855001		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF88 17648 bytes
font_01_sfnt_off0000ed35.bin
aa677b46134182b247c2e486a342b5051c8d6ab7db2a0cf678c944fcb8f21358		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 11108 bytes
font_02_sfnt_off000106e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 16792 bytes

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