Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ee8bcf91830a7a…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 16:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4b6edf32429109408f92701968e6f0ae SHA-1: 3100df22e4b582fc7fb4c485d9c12c01d331ccbf SHA-256: c1ee8bcf91830a7af372fcfb0c5924b8758d04c194f9838a86811ce1bc0431a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple external PDF URLs are embedded, suggesting a distribution mechanism for further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://abpaluso.com/upload/file/kapevujorinutuvanolo.pdf In PDF document text
    • https://philly.drinkpoint.com/uploads/files/zikapeveli.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/79924915794.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/konegezaxonobivorujar.pdfIn PDF document text
    • http://rilta.net/userfiles/files/45149743298.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/77434024032.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9cc8550a6---guteredesovebuvigexozofe.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/vefanibejosoguv.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/54401592862.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/48786193839.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/29805125492.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/tuzobotut.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/18838895165.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/xuvofisudomutuxi.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/40288069929.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/43104627706.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/muxizokurusumudowodom.pdfIn PDF document text
    • http://lecostationery.com/files/file/tabajirinizajarikilegib.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/jawukuzerojaxika.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/gobefunuruwara.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/difatuvalexufi.pdfIn PDF document text
    • https://hgb.se/filer/file/64981738361.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/xiratosatopakex.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/wizixip.pdfIn PDF document text
    • http://livilgirls.com/files/jikagivikumodopuzimemuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=toriel+simulator+fightPDF 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_off0000af29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 15244 bytes
SHA-256: bff414252b8de0646b07914e4e31297aaebf237f08c573b894440badbab4cf77
font_01_sfnt_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 10620 bytes
SHA-256: 2ac368c9a092d4d1f71ee4c003660faa321316a08d210fb5f0d24d7cf543c8ac