Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f917ea9b21ba36…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 14:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8255e3816d69ecfc29d6c8f22aca0b0 SHA-1: c28ea5e5535b733ce3a8823d4889af53933af0a8 SHA-256: f3f917ea9b21ba36449607aeaa75a6ba89af3bdb7737ad0a155095dbec0514de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO purposes, likely to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=nba+2k21+apk+offline PDF link annotation
    • http://russkiivopros.com/images/FCKeditor/file/31788682844.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/mirakazeguwowojugu.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/bimodukujema.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/78585272848.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/81435817764.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109011954079945.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109121632162884.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/89936984623.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/20007313288.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/fenivugumavudilokuziv.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/podaro.pdfIn PDF document text
    • http://superazs.ru/images/news/file/92584746832.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/degopilonupilupobakexixix.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/sedezaxilakaxokotagulimut.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/3486154801.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109050711344710.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/taridupizu.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/58020680691.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/77208465556.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/18017552240.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/55635999609.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/31252177428.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_off0000ba3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3E 17448 bytes
SHA-256: d722a515ab6b6c5627e3b0a422398e7d78dd9c94dc83735eb54f2582e86467c7
font_01_sfnt_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 10364 bytes
SHA-256: f5844d07c7a0f81ee9335be4cdb8ee0a075485550860c02430ffdb495ce3f8b0
font_02_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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