Malicious PDF — malware analysis report

Static analysis result for SHA-256 298ccd4b3a27b202…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 23:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3ddd83bffdc6ce4246a272323eeac46 SHA-1: 8e3b3eb6d93ab36dd707df5ead9efc18b1db8d32 SHA-256: 298ccd4b3a27b2023735fbc4108cafe9a234a1672c15b7053e35db7e10d5b09d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of these URLs and the link farm heuristic strongly suggest a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chandrakantmusicacademy.org/ckfinder/userfiles/files/nujolataviluwu.pdf In PDF document text
    • http://fratellilongoni.com/userfiles/files/13993480650.pdfIn PDF document text
    • http://sireny.net/share/files/dinegivija.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323e950e4ae---36192043672.pdfIn PDF document text
    • http://acril.ru/ufiles/files/bawuwebojemuvopufuzixe.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/befawejideludonije.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9f2d33da8---29101358555.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/mukakepow.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/31855441633.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/57911356293.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/48001728705.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/mabewenuzipefizuruvobiwa.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/61726576900.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/80364936215.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/94533268058.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/38125631061.pdfIn PDF document text
    • https://paperland.bg/uploads/file/56284872293.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/folatur.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/tojawifezuxikulogaboduxe.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/midobuxibifubetejetig.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/66956576290.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/18752201505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=zelda+botw+xenoblade+chronicles+2PDF link annotation
    • 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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 17756 bytes
SHA-256: 21c1b72000882a4f91f6742b4a482121e95d337f8c1bbed1853d5527918b1b33
font_01_sfnt_off00010570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 10876 bytes
SHA-256: 4060489de21340d8f7eaebba4a0852ad61ecfa8e1e31c32acf51614b1f49de2f

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