Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2fcffba3f1c12a…

MALICIOUS

PDF

78.2 KB Created: 2021-05-12 19:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 911187b9b0724b556e14284108a2cac0 SHA-1: 715d9c880ddb578a58fed4690415c0a0b69421e8 SHA-256: 3f2fcffba3f1c12a52e136208a0340d385bd9145f30c1a70fb003727d1d64ff9
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded URLs that lead to potentially malicious PDF files, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, which could be used to generate malicious PDFs.

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 https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a4210ac5---simasagexerizunefe.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/339dbbc139145a707a6e142da323b669/92801585506.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/jerosulatuvexokojevor.pdf
    • http://asesorgubernamental.com/images/file/pojovajujatoju.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a29990f9---dofosoduweponivaniv.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160717c7d6fceb---82752429339.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988a397c786---xabebezelatelug.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607652dd9f52b---depepezanawikeguganuko.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd7467efb---81379167183.pdf
    • http://interel-rus.ru/test/sites/default/files/file/80410610013.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795fc7d248d---mokigojupitenikuwok.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079d26958276---60720797317.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827de32d572---56477432341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=political+campaign+field+plan+template
    • 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_off0000f61b.bin
b48e49c9e521163d523aa579d77b1e9f809b36d0a5b6e816c9e249a83295b4f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 5204 bytes
font_01_sfnt_off000107c7.bin
0b99361577b75da563ce82f9fb2f8474346012cbb0a65d708b41f14de66797b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 10652 bytes