Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6a756bd6d980f6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 23:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14bfc37dd3b7c8b7601a54f083101494 SHA-1: 0538e22e8d2947580b660febd688036f5029ac50 SHA-256: fa6a756bd6d980f67d522e2f277889c40a2f3cb84a5dae5393771f8473b9b601
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=about+pawandeep+rajan PDF link annotation
    • http://arohitourandtravels.com/userfiles/file/fejunetinigu.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/43626965301.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210902_3AAF8A054BFAF36B.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/tireb.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/pakapavejojanuvexoxuke.pdfIn PDF document text
    • https://eslms.com/userfiles/file/40690325122.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/zixelozaxabikumi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/uk0qfs66go4indbjl4f9cu76v6/29178693055.pdfIn PDF document text
    • https://htchninc.com/d/files/90579775803.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/53797260713.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/47226519323.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/dimisepamowiditilokededuw.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/nukezanak.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/49868963583.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/56352613081.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/81906513524.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/88129510643.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/63467336548.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/sozilibanam.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/71447818493.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/zenavetuniparupite.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/98600010197.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/44433175534.pdfIn PDF document text
    • http://badgerhillfarm.uk/jaguzobo.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_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 17648 bytes
SHA-256: e89867dfefc8d2caf51af11d766430a92093f7ae4349daa375fd25cd480a0f49
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 10516 bytes
SHA-256: 1b7ebcd9d7f2ad988e866ae30bcfd27dc6dc3b3a0b9e0038f11def2d797ac69d

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