Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf9998cbbe6e08b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 22:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2cceaa29987494be062e6c20495617c9 SHA-1: 8776c5ed0c3a7a88d94f7a9a35e24948920d95c6 SHA-256: 8cf9998cbbe6e08b6040f352fc24a5fe803cafb9b04032c68b0c56c3a493b603
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://abaj.cz/UserFiles/File/velakotituzejeluxaveb.pdf In PDF document text
    • http://mutitar.com/user_img/files/36021513037.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/tagopemaluno.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/vipefavajanobapuwobefid.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/40802972478.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/fosabodidojibozepof.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/24074284131.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/jeriwudurut.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/95684950643.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/tokejunuvetakuwiterem.pdfIn PDF document text
    • http://bjjiffy.com/upload/37349724444.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/juvalatipoje.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/62496716720.pdfIn PDF document text
    • http://staropolski.net/Upload/file/vexelutanazagagezaj.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/jivafuxiwivamujeve.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/muloxaxozapuruji.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/98353080368.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/padutoxixagowobu.pdfIn PDF document text
    • http://grotech.in/userfiles/file/zuwifugej.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/91073916518.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/wagezaxeduxerozu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614032b323a6d---kifobexasotedoxunemus.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/92393794143.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16132e6fba50dc---bopise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kodi+apk+modPDF 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_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 9988 bytes
SHA-256: 7efcfa989763faa09639e8fd5c0472585ae394a3f721379770b0e627bab6768b
font_02_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 18828 bytes
SHA-256: cd7b99d89a941fb36589f27afa1e32f5ae4bf6b70eae833b28e206d169201775

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