Malicious PDF — malware analysis report

Static analysis result for SHA-256 52078b6556e9af0e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 01:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5433cb1b662457ac3858ca53dee34496 SHA-1: 3329f8b5823eff5df3742993c29b4a9f57f17ff4 SHA-256: 52078b6556e9af0e62ced1aac97cf21a62a4a44b0733ecad1593d56d51bed39a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct hosts to obscure the malicious intent, likely to distribute further payloads or phishing pages. No scripts were extracted, but the presence of external links suggests a download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=naruto+comic+book+pdf+download PDF link annotation
    • https://chsins.tw/uploads/files/202109210647328539.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/70665855046.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/givurevumexudaxagegil.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109161611216784.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/papojipifat.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/xubufokuvafukositujoxuz.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/mefitowozelevegetoner.pdfIn PDF document text
    • http://ativn.com/upload/file/74433389634.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9dfdec94---40521440595.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/8925986751.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/nedugujuzedogiwefiju.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/93162600787.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/bojakededib.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/46655501858.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/wuritipimatapun.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/vamidevidized.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/xajeg.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/52648885276.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/fizanojawu.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/60325612562.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91184776141.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/timefix.pdfIn PDF document text
    • http://ontech.vn/images/ckeditor/files/dupuzala.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/lagulokan.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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 17224 bytes
SHA-256: fb4fe429c921117334a1239a95552ca88d15ecdfc26fb9b2fba68671600e1d5b
font_02_sfnt_off00012714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12714 10876 bytes
SHA-256: d604a65d914580ecf9e910ab7b2213dd1dcc6bb39929f13b8cb1acf43d4248bc

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