Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a63039274b3098…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 11:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a64524f9c653061a23facc08309d7820 SHA-1: 8fe0f1ca42b8a8e42fd7d570c94baab6827a9acc SHA-256: a5a63039274b309842d6d4443faf29209b47ed89621ff4c497ed91e984c2b245
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious or SEO-manipulated content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seto.cz/uploads/42529231949.pdf In PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/pubekewawebawiwafix.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/83247229091.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/45160917937.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/puxakowi.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/zekirojasebuzu.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/xenosipizatuvuxigidesom.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/85755500862.pdfIn PDF document text
    • https://eventaipei.com/upload/files/36838872291.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/fujegilojuderodemov.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0d16d9c88e58add6a777ed43baa5be04/44760515151.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/24921307677.pdfIn PDF document text
    • http://e-district.org/userfiles/file/pebazosaxolugiwoluwan.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/69173304549.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/dibikeburufo.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/farigugitadulona.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/saziduferofenon.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/17519543771.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/lelajoxumekabetes.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/zarufijawobogebuverufu.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/24915609495.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f8b6731a---pivobawawotudupuzomufofed.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/lurasuwozepijepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=avatarify+free+downloadPDF 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_off0000cfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 17244 bytes
SHA-256: 6ee53ca5dcf9804fde0f01a0d1de8f7f0ea35e2e6beb5653724d4055712d83d8
font_01_sfnt_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 10428 bytes
SHA-256: 8ec7a789dcee65b6b46c53bac23cea4d7ea9a1db832ed85bcce6fc0123cb819e