Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ef6e36904e71dc…

MALICIOUS

PDF

73.3 KB Created: 2021-05-11 05:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23c4193305c1d7f46bd450e7e3550dc4 SHA-1: d7a792e1d5648621392b020380f6488ee6765a8e SHA-256: a0ef6e36904e71dcf2c6cb5d20ffbb8257d72bedab1d6f018345e94796b4d923
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains embedded URLs pointing to other PDF files, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'messenger apk version 2018' and 'wkhtmltopdf', indicating a potential lure for users seeking specific software or information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828b3042bb9---81642143469.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082052d567a8---veranefojekagidok.pdf
    • http://arcomproltd.com/userfiles/file/tatitedunivisozi.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/i4hr4nnn81331ifvtjjor0u846/sigodenisasir.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f8cd84546b9348e67b212d2b33eba31b/97162935959.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/49547687377.pdf
    • http://consulcongress.it/uploads/assets/file/narijedijebixoxobasu.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ed369b0c85af0a9e4ef21fd43080b6cd/gemasitu.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/65o6gvjdmtdjkf5304u0tv25s2/perurapawifu.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ab0d42b28bea81c0a06bb26a1a887fcf/bivizezodedomowe.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431b961044---puvuwajotam.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0d1e63a0---22952466200.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5e8779ac5---84012738791.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/eed5a301e595af48272adbf7e6009df4/46891229173.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aceed31edc---sizakirepavexe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=messenger+apk+version+2018
    • 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_off0000e2ff.bin
597c90389a4bdf37e1677e6b8dafc3677d0901fd8949d51fee0a460453afd1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 5604 bytes
font_01_sfnt_off0000f635.bin
ca77aaf68a83639349547e249eba521c282ef3efa6beed55e66b04867d2c9cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 10156 bytes

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