Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2ea631e135e615…

MALICIOUS

PDF

75.5 KB Created: 2021-09-29 04:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9a8dd62d9418d980a719ebd85b1ecf21 SHA-1: 12c3599811568fc7a0dc121d51cf80d186891ae8 SHA-256: 3e2ea631e135e615e8ecde295cb80f0db3c568b09732e9327d07bec20b533b69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the presence of numerous embedded URLs points towards an effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://origo.ws/userfiles/file/73066888916.pdf In PDF document text
    • http://palestraarkadia.it/userfiles/files/99779943448.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614486c135294---mamipi.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/kidawijomakomefifexi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/644ef82eb6cd5f242e6d780890432112.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/nonimazerinugi.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/tirukevexabadapugubu.pdfIn PDF document text
    • https://remini.hu/userfiles/file/57783252247.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/zuporalelev.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/wogawopivu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/79f4504628d65e147c404ea114b45419/gupuzokakimizopolomuwiva.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/70408273895.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/xemumolamozavevidit.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/98700960023.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/xuboruselofilulaziwow.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/46570418641.pdfIn PDF document text
    • http://chirineli.com/img/lib/file/94161400502.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/13489990621.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/65555145811.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210918232248_387842555.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/rutokasudekibe.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/nosufobutomix.pdfIn PDF document text
    • https://sentralperdana.com/file/27067679336.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/169976671.pdfIn PDF document text
    • http://salt17.com/userfiles/files/lolezaropuzemexagedi.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/beturudegasakuset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=carmilla+film+streaming+vfPDF 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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 10532 bytes
SHA-256: 4f8a2b1d7929599c91fee297d3ae574f609d65f3c3f696064285eec2784921dd
font_02_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 18700 bytes
SHA-256: 62160110d1313a94bcfcca1d3142a7a0a1730657f6c6f9ff65d44a5c4f7a41a3