Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bf54af3775f951…

MALICIOUS

PDF

86.3 KB Created: 2021-07-04 05:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e83ae037585ae1bcfb80c264bc8a6d44 SHA-1: c672202a8ef5cf25db971d25fe451d05634ea2b0 SHA-256: 55bf54af3775f951f5d2483ec422be2d22996c5121261f5fcac78df4aba330b8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded URIs that point to external websites, suggesting a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the presence of embedded URIs and the PDF structure itself are indicative of malicious activity, likely related to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=what+happens+with+martial+law
    • https://pilot-nav.com/ckfinder/userfiles/files/16152931677.pdf
    • http://qctc.vn/upload/files/64895235986.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d52661955d---99894405931.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d4165a48db4---39529773316.pdf
    • http://thingsantiquesla.com/userfiles/files/37458074821.pdf
    • http://movitecnic.com/ressource/site-image/files/26788929377.pdf
    • https://cottonweb.net/userfiles/file/wutizepilorupobosemiti.pdf
    • http://msslink.ru/userfiles/files/pixawurekelel.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4ef5b68cb375259fa850c9750669563d/92265053377.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/b95c253b7e4442a98911c348627c38b1/75033165984.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/bikiwe.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a987fbbe92796a905da78585264d6c51/tirategefenafopupesuxi.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085794190014---43555220205.pdf
    • https://bhsbeacon.com/FCKeditor/file/7866752674.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7ae6a9f37a2a7bf06688c21769f6002d/49061148580.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/lepagowepovulogebiwi.pdf
    • http://rayer.cn/d/files/34569056778.pdf
    • https://echipamente-scule.ro/userfiles/file/basojegowamejolobok.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abcd6c45dab---58128398097.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08ba57696---josufir.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/67b85ffa9750a238d165a763505f232f/75375457439.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/krin1o4vb96dioglaa5kadq1e6/43020783626.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/df329fecafff368d8471a835484e3ce1/dinovofikili.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/3k192q9cn09oq7m6e87ssagavp/jubatawogutefa.pdf
    • http://ydis.kr/userfiles/file/191915566196.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_off0000efb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 16792 bytes
font_01_sfnt_off000107cd.bin
bf7feef0a310521096819532033d401eac6803c226568068910b409fe5e5bda0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 10476 bytes
font_02_sfnt_off00011f69.bin
9d4969cf1e9e267a9d18d8e177535385792badb8f621043ebd1b9247f7a8fea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 16952 bytes

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