Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2744494f2e39c89…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 03:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24843ffe161b42e248405693cbd84d31 SHA-1: bba1c109de3f6631a2f90dca064d8f8499390d23 SHA-256: c2744494f2e39c890fdbf2516c5e9edee87f459bf99bf2c68699aad731d3be9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis revealed it functions as a link farm, containing a high number of distinct URLs pointing to disposable domains, a common tactic for phishing and distributing malware. No scripts were extracted, but the PDF structure and numerous external links suggest an intent to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://eltonltd.ru/sites/default/files/uploads/nujefekedame.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/dovonanitolitesalagudo.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161367bd8682cb---sigavuxafegu.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/lilabuvalix.pdf
    • http://hcvitamin.com/webroot/img/files/82570158468.pdf
    • http://marthomaiticherukole.com/userfiles/file/30901086705.pdf
    • https://pannonfinanz.eu/editor_up/64445621510.pdf
    • http://techniq.ae/admin/uploadfiles/file/93400972751.pdf
    • http://studio-orlandini.com/userfiles/files/49610064054.pdf
    • http://word.mn/uploads/assets/rekunisavasuzu.pdf
    • http://wasserentkalkung.at/ckfinder/userfiles/files/67757661936.pdf
    • https://mbzl-pro.xyz/web/img/podborky/files/88055111148.pdf
    • http://www.centrosanmarco.eu/img/news/files/86922269650.pdf
    • http://dycelife.com/userfiles/file/kozawebotemaki.pdf
    • http://theheavent.com/userfiles/files/jezokowapakadeki.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/godofekinemi.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/92007149788.pdf
    • http://mgtuae.com/uploads/file/daresetu.pdf
    • https://rumahbaruku.com/contents/files/12619726261.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15186324309.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lokicraft+new+crafting+game
    • 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_off0000b60b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB60B 16792 bytes
font_01_sfnt_off0000ce1d.bin
07cc6f8078416d9151e432e9791875fc465d1d73f44412a115e1c54f936d699d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 16868 bytes
font_02_sfnt_off0000f96b.bin
a016b095d91b1f99911650bb2823adefb9eae42082d3dd3c6c1cf70891503651		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 10600 bytes

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