Malicious PDF — malware analysis report

Static analysis result for SHA-256 0376544a08288433…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 06:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0b6883bfaefd5151ed06b6500f7ac7e SHA-1: 86df5a9d25200d2fda10e707a5de39d0b7fc4f2d SHA-256: 0376544a082884334ed99a086b1aa70222b5da5048c66c9fa291a7d77ffd2e82
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=image+cropper+android
    • http://ourpreferred.com/userfiles/files/vamivom.pdf
    • http://stjconsulting.it/userfiles/files/puxojoxopinevajuxa.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16148e0b732b0e---towew.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/mokotasudemabiniferudisaj.pdf
    • http://studiolorenzino.eu/userfiles/files/wegujituwemafekugapeneji.pdf
    • http://feynburg-uhren.de/uploads/11373381916.pdf
    • http://budropol.de/Upload/file/92334770365.pdf
    • http://skazka76.ru/pic/userfile/18059831347.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/bebivokafogogepan.pdf
    • http://chromowane.com/userfiles/file/rerav.pdf
    • http://wronba.com/uploads/wysiwyg/file/56060410338.pdf
    • http://lumieye.com/userData/ebizro_board/file/fufazil.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/sasukebafeterukojexa.pdf
    • http://joesservicecenternj.com/userfiles/files/kisanabujiziguboj.pdf
    • http://gaishachuukobuhin.com/js/upload/files/xasopigivevaxibopofumemi.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613019d4ce741---bibuvovodiza.pdf
    • http://classicalgardenornaments.com/uplds/file/94803721910.pdf
    • https://traicaygiasi.com/Images_upload/files/jefebexasanil.pdf
    • https://tlproduct.com/userfiles/file/41155471696.pdf
    • http://hennel.hu/sources/elemek/file/90694799370.pdf
    • http://net-marketing.hu/images/files/gulexutegatusulu.pdf
    • https://qkon.ca/images/file/53376278865.pdf
    • http://karthikeyanjayaram.in/userfiles/file/44741444608.pdf
    • http://webhoctot.com/app/webroot/uploads/files/28098553796.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_off0000b6cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CC 16792 bytes
font_01_sfnt_off0000cee3.bin
6a899c89d185538e1ccc635fdf903cea6facb94768af38e4021ec57a21067a8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 10496 bytes
font_02_sfnt_off0000e664.bin
9a34e994fe9e2848130b4ad92e4cb947540dd99215d58504397f3f666c1156c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 18632 bytes

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