Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebeb8f8fa0ecf85a…

MALICIOUS

PDF

73.1 KB Created: 2021-04-28 10:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19fced2767a869c2bfd6dc77773345c8 SHA-1: 29e4807e2ff22cc442ffad49061de8c8e70cc41f SHA-256: ebeb8f8fa0ecf85a80a03b35262e099ce8e56580051878cba8526fbe2fc9026e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'cardiology journal accepting case reports'. Numerous URLs were extracted, many pointing to potentially compromised websites hosting PDF files, suggesting a phishing or credential harvesting attempt. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the delivery of a second-stage payload or redirects the user to a malicious site.

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 https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56c89578f---nilanefodadi.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/27e97ae2b49b876c7cddb68b1e9e5e14/54704173989.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/35b05eadca7149729eb7a3706b2e0ba1/32880300198.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853c5d5ce---90457340133.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22bc72d6d---giduzanimuwo.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f23716ab---72159814371.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa200b17c---kifapato.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hhcdhbdr3klp8vqkhb4ubvhke5/tubagajukefabijoz.pdf
    • https://ludifrance.fr/userfiles/file/kozijoporedisij.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/cca6gavtlg68blt7qcfnc48214/82015861869.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/a931c383e7b4dc7298e170feb24207a7/tixoromoluwopetak.pdf
    • http://abacusnancy.com/userfiles/file/48025198760.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/p2u1mvfk63hkge7cgi2ufsu0p7/zapuluvojejarok.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/61b323d91b15d1561e8873db7f479e58/movatulotorabomotetoxen.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3e3a6965badbefc5c262a0ea43162640/nusisifurulitulixunupito.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/525a5e3a08a75542788ff04e7d915e5a/detojekugofewozal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cardiology+journal+accepting+case+reports
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ba6a6b6f995420f0842271849813e1c/kumujetuzotidefuxadeselen.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26f.bin
8b292b269123aca267d785296e82151ebbb5952a477c78d579c9953c678e943a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 5324 bytes
font_01_sfnt_off0000f4a2.bin
b4b82b07627811bba5769d95979cff3eb50204567270027352a79dda048c4ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10132 bytes

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