Malicious PDF — malware analysis report

Static analysis result for SHA-256 382f348d91e1eb4b…

MALICIOUS

PDF

88.6 KB Created: 2021-09-12 13:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8492b2399e203089411c484c1582bbfb SHA-1: ac6cefb0595b8d4215ea4fb73827ccc342053bb8 SHA-256: 382f348d91e1eb4b1e43a14dd239cd70f9da5db4bd9823357be6e108fc5ce2af
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination. ClamAV detection and ML classification strongly suggest malicious intent, likely to deliver a phishing lure or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lishasurgical.in/ckeditor/ckfinder/userfiles/files/wifuzixofixuvase.pdf
    • http://khunghinhdepphuctin.com/media/ftp/file/zujorofakemonapudiruwaj.pdf
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/3332359685.pdf
    • http://rayocazar.com/images/elfinder-1.1/files/file/bidurukibomepinalegenoge.pdf
    • https://alstar.uz/images/shared/file/82358623303.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c185447fd31da1f5f0da7959d6b11041/23447034495.pdf
    • http://househouse.it/userfiles/files/70288841625.pdf
    • http://qapoll.com/2015/vat/upload/files/11868224459.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/32157875734.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/tolidotirozositorulibax.pdf
    • http://appartenvue.net/appart/upload/images/41309219316.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333ad37eb1e---93941676311.pdf
    • https://mdteam.se/ckfinder/userfiles/files/82420767170.pdf
    • https://heritran.vn/uploads/news_file/33596646276.pdf
    • http://dakov.hu/_user/file/97253110546.pdf
    • http://idcla.net/upload/files/rerama.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-10/20210910225127714863.pdf
    • http://envisystem.com/upload/userfile/files/duxabovudomumevivodam.pdf
    • http://lnv-cnc.com/userfiles/file/51144986612.pdf
    • http://sibaco.ru/ckfinder/userfiles/files/tedenowidalufele.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/labozepesidexuzub.pdf
    • http://myucpb.com/userfiles/file/sunekawojutufu.pdf
    • http://cuspsurgeons.com/userfiles/file/binevoxifowurasuna.pdf
    • http://aaykpn.com/uploads/editor/files/40508063262.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=2+and+line+app+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf7.bin
c34e7a86d1c7a30dbc6815dd8c80eaaf8580dabc74dd3a7b2682f8db8154e645		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 10128 bytes
font_01_sfnt_off0000f2b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 16792 bytes
font_02_sfnt_off00010ac1.bin
94e7209930c942868d8b7d09daac5721bd22751aa1b62241425b1eaa89848069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 17228 bytes
font_03_sfnt_off0001245b.bin
15371085a45595ced14fef08354134efe97fdfa8b1c3f72c745c608139bec7c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 18344 bytes

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