Malicious PDF — malware analysis report

Static analysis result for SHA-256 64112f8dacc14eda…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 16:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7bf774c6d9d6b3ba6662d5a57909673 SHA-1: 18b5f5b1d3bfe286e0c945433288cc88e16450f0 SHA-256: 64112f8dacc14edad935cd257197304ff03cbbd60cab14d7d3b93249c485efcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable hosting and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://infrive.ru/uplcv?utm_term=forza+4+apk PDF link annotation
    • http://pizzeriagiganti.ro/imagini_ws/63297659836.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/in8ckoqsrkugrrn44117d4nvou/lasutipotijelikizesi.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/93675164420.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/wutafejitomepo.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/vosepek.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/xixizi.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/17150366990.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/lefibinefulalodela.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16141ab0bc1dea---wabaporexibadexujadabugu.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/36150917240.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/mibogubodu.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/dilifamaf.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/jorukusedanasutewexoseb.pdfIn PDF document text
    • http://furniture83.com/upload/files/kazenomekuvodal.pdfIn PDF document text
    • http://turatabor.hu/media/xevijukutuxoduzo.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/kubanimasewoset.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/51281512433.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/43247649563.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/46920917585.pdfIn PDF document text
    • http://umhouses.com/uploads/files/jigulukizoned.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/minuwefivu.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/84619373270.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/gukonekulosibas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 9812 bytes
SHA-256: 2a502177503c2cf538c8b864add22928b8f1fb56e8148e264eee914560e0a93c
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 17044 bytes
SHA-256: e0e1ed010a5c1c3c7372827fefa149268f150c83ca8222b582baea04cdabf8c6

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