Malicious PDF — malware analysis report

Static analysis result for SHA-256 661405a353c3d31d…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 06:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75b0a8f707c1ff3a9d64038391b73e7c SHA-1: 0a6f8a62e216b4f6d70604a94959bbfaf1ffba5a SHA-256: 661405a353c3d31d8ad675efffdba76522afdf9cb206a564a41780372269c96b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'smidgel.ru', which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body is heavily obfuscated, but the presence of external URIs and the high risk score suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=personality+type+of+psychopaths
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/32805017c315dff204b056f29b9f1d95/72820256386.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083abf94823c---xetawuzibitesom.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a02061f13---budegoxitufedunituxi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dcc5d20f9---8302208585.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea8059069---jopojapisofifobumunada.pdf
    • https://lee-trading.tw/archive/upload/files/xuduvolelobezapogonewem.pdf
    • https://balajitutorial.com/admin/userfiles/file/sogevibosedanosiguve.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/3191af8784fb35572b42435fbf6e9047/livaxufoninorajiruxa.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13a3a45a63---muxewutaninubi.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf27dbd982---52770230058.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e070b913e---vadejilezigi.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a89c3578fcb---wumiberagilufaxufurosixo.pdf
    • http://marcobernini.it/userfiles/files/zexutedabonirikikumipidiv.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/86592014487.pdf
    • http://amdind.com/userfiles/file/vibuf.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607150379acc2---veluzij.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa813d4543178a2cae4ba9e871d36e9d/sowuzas.pdf
    • https://subarini.ro/mm/file/wumobu.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7ee02cb6ec166bd5896f79b97e6cb966/2823691756.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ebc5ef031f3fcfa8e86cfe0b0b2b71f6/wewitovaf.pdf
    • http://from.ua/upload/articles/2021/06/20/files/xasigokupalomekabodeme.pdf
    • http://proxkimya.com/resimler/files/96862531409.pdf
    • http://luingpyrex.cz/foto/Image/file/62855676042.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_off0000ed96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 16792 bytes
font_01_sfnt_off000105a8.bin
1e672dfa13b6f6344ef82dd08c67ac246b7774174d5f130c69a725313541c900		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 17192 bytes
font_02_sfnt_off000131f7.bin
574c4f64e255028de50c26a8d3191a08798a080abdb074dc5558867744169e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 10692 bytes

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