Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf57783cbfc8f03…

MALICIOUS

PDF

83.6 KB Created: 2021-10-07 06:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d1a6f614fef8c6960f485f116608d7c SHA-1: 9f8073f2f891907a61f1176d0e94f2862a8b3b7a SHA-256: 0cf57783cbfc8f0317eec7c380da54a8bd701c3a65eb526d033c51cd40cd945b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of link farms or hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to external redirection. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://huntic.ru/uplcv?utm_term=state+of+michigan+department+of+natural+resources PDF link annotation
    • http://orvosvalaszto.hu/uploads/files/vonowerewetasogizev.pdfIn PDF document text
    • https://harmony.im/userfiles/file/54034858055.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/xatumemepa.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/zojigatosopimagawodex.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/vuxedonigitenotona.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/12642216457.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/359277309.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/62677133001.pdfIn PDF document text
    • https://alohasafaris.com/files/70535813899.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/foguxosatigulevi.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/rinigodifemazewek.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/vebavomidir.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/xamomosabiwuzamor.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/954fbadd4069de35d55e14f0c5608a4e/tutom.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/32619655326.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/41491335761.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/97915201917.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/65918334764.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/8564608282.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/witefibexakaxonofobazaduj.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ccd69501c9---62746186880.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/7659294875.pdfIn PDF document text
    • 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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 18724 bytes
SHA-256: eb7543552ac8df0e2a4eb76c045bb801eaf6812c77d72d3d057171e1ce7bccfe
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 11244 bytes
SHA-256: acf7580659a1d16219491aba96fbb7dd7025ae1fc5a48ad06d3e3e893a4638d4