Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b2b024f29b8ac7…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 01:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8ab8681546f5209f797756892a8b0c7 SHA-1: edae4ee135f9f0dbb22d7844d256cd1fd4d74607 SHA-256: 93b2b024f29b8ac7a9adb675a0f0891fd2942ac7948120109a214d9db8edff0a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing malicious software by posing as a necessary update or viewer. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving exploitation to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=incognito+history+on+phone
    • http://worldnaturalfood.com/image/upload/File/8776311359.pdf
    • http://sutipatika.hu/userfiles/files/kuses.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/17742170204.pdf
    • http://parcroyale.hk/userfiles/sugutob.pdf
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/jopowuvuxakeva.pdf
    • https://duongthuy.net/userfiles/file/32764896079.pdf
    • http://kvbm.org/pds/userfiles/files/80518982376.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/98121981d55fe4d82d5457a862738099/97942903540.pdf
    • https://jjpremiers.com/files/74594500550.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614211ffc5d4c---80832337228.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/dobajapijimugokekivake.pdf
    • http://radecznica.pl/userfiles/file/busapejemolejelejosibiv.pdf
    • http://autofactory-jin.com/js/upload/files/setivewuxosivabazu.pdf
    • http://krr-nfe.com/suratnfe/UserFiles/File/xevufekoxododo.pdf
    • http://muszempilla.com/files/file/mozawevapewinapiwak.pdf
    • http://runhouchem.com/upload/files/xirujenanapogafozolulem.pdf
    • http://pastadimatteo.com/ckfinder/userfiles/files/wetaxulakufonemuxos.pdf
    • http://didula.ru/img/file/jixoxikelelasu.pdf
    • http://viviapalermo.com/userfiles/files/18738823064.pdf
    • https://xn--atpta-nfb.lv/images/userfiles/files/44374270289.pdf
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/84532144273.pdf
    • http://theprofitnesstrainers.com/userfiles/file/97084340753.pdf
    • http://reliancefla.com/admin/images/file/luvub.pdf
    • http://rakkhunnursinghome.com/user_img/files/61343375573.pdf
    • https://ski-valloire.com/ckfinder/userfiles/files/91828819842.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/11139653472.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_off0000b536.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB536 16792 bytes
font_01_sfnt_off0000cd4d.bin
7d34d2223c0864b4ffaeff3c4afb9e6d032c74ec8318f0883e080caf07a8864e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 10508 bytes
font_02_sfnt_off0000e533.bin
6e8c3a0a50328a99dbd507ec2c25f5461600148ebc4218f17c80be5bb8cdbd00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 14440 bytes

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