Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee841e54d818fbd…

MALICIOUS

PDF

67.9 KB Created: 2021-05-02 01:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17bffb93cc243ee01cd8135479f68536 SHA-1: f865eb05983fa0b47ebebee597960bae8c6971b9 SHA-256: 3ee841e54d818fbdb83f5b833c8e50f3ed2adaa85686e529c11d5e02032d89de
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple embedded URLs, many of which point to potentially compromised websites hosting PDF files, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its origin as a generated document possibly used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://aimic.com/userfiles/file/44862522856.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/557baf43f96be1cb21b90b4ec5db4f67/84198743057.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8cbb16068---50678330192.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa10ae4dec---zagidoxoropuwomuj.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ddvmmkckiqspqavcp849qvqjho/dowasefelilaxema.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160782961b9529---7884569122.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec61d7964---84598190437.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/af259ad09caf371c30e6e80ace5bed93/pesezixegozazil.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a6c1aa91---13031686026.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/fh7ore867k0ddmmbutiol5nn2d/10805324355.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/0a92423f678593e2bc9891875bfae45d/lijaberolazalebuzuselaji.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160882b3895691---dapukofikogiwosopedebob.pdf
    • http://agcslohian.com/userfiles/file/nomeropidazapip.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7548bea54---54338070836.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160842cc87ca7f---34090171223.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=channel+9+guide+vic
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf55.bin
54ac2e3eff44b4d5f7f988257cf025563ecb30f1db8f18f123b1022fb3bcf71c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 5048 bytes
font_01_sfnt_off0000e08c.bin
2d5b03abc8d87aa627a421f212a78d2df92eda5e07c173c0866c4b1105fc8d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 10120 bytes

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