Malicious PDF — malware analysis report

Static analysis result for SHA-256 59dae9653381b4c8…

MALICIOUS

PDF

95.8 KB Created: 2021-07-01 12:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28dba46d3c64884d0a5d562ac442dc68 SHA-1: 4423ac4f736578e9e781bb234f4be2ebc0c66057 SHA-256: 59dae9653381b4c8df8b6b9d5db050e5468aaf362338814d40155b360da7ccc7
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple embedded URLs, many of which point to PDF files hosted on potentially compromised websites, suggests a phishing or malware distribution scheme. The wkhtmltopdf authoring application is unusual for a typical user-generated PDF, further supporting a malicious origin.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/csds40ljn713qh3hi1q5b357vt/26159575011.pdf
    • http://adaviestransportltd.com/userfiles/file/91847947196.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d96ac193f6---37472278817.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d34fb6c9a61---sitabopifiwugevori.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/959f46284a133d5adc2caf00a324cbe2/matopij.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607045a9cf5c4---78632497913.pdf
    • https://dukra.sk/editor_uploads/files/80464106855.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ebpeidckaaljv0n2kan5vu43bu/34872733077.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47ca1a1d0a---82432309220.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9d9739c1---liboxi.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a75cba89509---11447776220.pdf
    • https://ooo-kenk.ru/userfiles/file/nazikugusu.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8528558f47---kixax.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa280b84089---romapupirenifelagojarazug.pdf
    • http://ashioke.com/images/library/File/lazukapep.pdf
    • http://solac.nl/app/webroot/files/userfiles/files/xowivojejobeloxez.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aa37ae9b3---75583852895.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb3265060---takopolulitumod.pdf
    • http://astro2sphere.com/admin/images/file/50861309510.pdf
    • http://shipsupply.ru/userfiles/files/29142134155.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4c617ac48---vagowonobofazinemupu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdf+editor+online+free+without+email
    • 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_off0000fc48.bin
675df3acd14ccd167e60a0012c353d1d047e92af5694cb9a6c47eb75fb56fa77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 18628 bytes
font_01_sfnt_off00012c20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 16792 bytes
font_02_sfnt_off00014437.bin
d0c7def1ed55be7ba96c54ed9dc0882b85c6a1acf5b7e4227366c00fe94ab2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14437 10636 bytes
font_03_sfnt_off00015c5c.bin
eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5C 16132 bytes

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