Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f55f1524062147…

MALICIOUS

PDF

67.6 KB Created: 2021-09-30 15:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4c85ad4c9b513f0e5db2c1dc5dbd3984 SHA-1: 42d3555794607fa6ea748b9709a34165f86d4130 SHA-256: 05f55f152406214793ab25cbec365325cc551a62d11a6b9042fede49182ef050
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social-engineering attack aimed at tricking the user into installing malicious software or providing credentials. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://gniortho.com/files/Upload/file/vumukekikuxul.pdf In PDF document text
    • https://panoramabyty.cz/content/33456464045.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/54665275696.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/64442516849.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/34370398715.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/fadoxigi.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/71560130976.pdfIn PDF document text
    • http://tcihk.com/userfiles/lukejolexonevonimoxiru.pdfIn PDF document text
    • http://1111.morefriendship.com/upload/files/semonunoletalesamigagi.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/22194352102.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/jimagodijudubepewu.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/99102421905.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/cbecldp1pe5o06h0nvgiqmalc7/kiwaz.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/duvik.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/2985574898.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/78877703932.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/75629994718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+theme+for+my+phonePDF 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_off0000aa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC271 10492 bytes
SHA-256: 76e9d2b68a743db3c6af70953ad7e6898d7af39af4e4712592abdd4454112b1d
font_02_sfnt_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 15476 bytes
SHA-256: c47838f8fcc461d975ebef94f2614ca1bd8f1db8f51e560bcc559444e3189248

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