Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66f2f1d7c820016…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 16:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f4edc9a1004ad2fc149352571adc3ad SHA-1: 76906e0e7e65eb0a5ee151e84483f6a2f3676b62 SHA-256: f66f2f1d7c820016c857e2d74985d7fa87a756a58fae5c5eb5ad3888b53c83d6
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 are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.pranabkumar.com/fckimages/file/tenumafilupix.pdf
    • http://www.look4job.gr/images/_user_na/file/40542967859.pdf
    • http://snuhonors.com/userfiles/file/gaxowuminefuputaxor.pdf
    • https://rainbowfurnitures.com/files/files/rojabilibatewazevug.pdf
    • http://marsalanoleggio.it/userfiles/files/35295814328.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f833aa67---59010847234.pdf
    • http://hotelbasantresidency.com/uploads/84464958580.pdf
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/didor.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/58909373625.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/dotidopug.pdf
    • https://kaktutzhit.by/uploads/files/16855614376.pdf
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/95181671793.pdf
    • http://staceyasp.com/UserFiles/file/27786641918.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/8cfd09263771ca1f5d8ddff66a928c68/rejigajolexika.pdf
    • http://gardens-spa.com/user_pict/file/pipitavodiruzo.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/timono.pdf
    • https://movimientofamiliadejesus.com/images/uploaded/file/dizugazatix.pdf
    • http://fueandhair.com/userfiles/files/rikaziv.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/bilapifisugegelaj.pdf
    • https://hippodrome-compiegne.fr/www/uploads/file/beburebiwowogosup.pdf
    • http://timecraftz.com/userfiles/file/betub.pdf
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/lawitebaza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=assassin%27s+creed+2d+apk
    • 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_off0000c4f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 16792 bytes
font_01_sfnt_off0000dd0a.bin
fa0ca0e1ca5fa64cffb667edd5b10064cf9268517f4d330d6a913fc571e33bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 18512 bytes
font_02_sfnt_off00010ce8.bin
f137bc2638f5176c3ce4cd4cf72640cb7358ba9b209ac30b806d3632af7d2a88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10468 bytes

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