Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c330b0b1e326c00…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 05:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 59874a2160e8948bbf27601a06f8ff8c SHA-1: 91ade8902024a47e85c955966b43799515fc1aae SHA-256: 8c330b0b1e326c00205961a44a64546cb5790603d8fa1a6a5997a9d12c722e44
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF contains numerous links to external domains, suggesting a phishing or redirection attempt. The presence of embedded JavaScript (T1059.007) further supports malicious intent, likely to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=obb+file+of+free+fire PDF link annotation
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/najelemutasopewavit.pdfIn PDF document text
    • http://sartor.ru/upload/files/9467096914.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/15185452544.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4101315c---76410512233.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/diroxiwogi.pdfIn PDF document text
    • http://tion.hu/upload/file/34482822530.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210908201158.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/zapus.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/veruzek.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/reur18sct17041cph12jko0te4/masorobaxasu.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/86489631909.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109211202088142.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/90741124350.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/20778600195.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/39292458654.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/kotukowurapo.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/300660440.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/74292142641.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/kusikimo.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/20532541887.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/43743284973.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/muridokuruwanisolopixod.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/jusumogetumulivaxosamidu.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/10363394329.pdfIn PDF document text
    • https://sealskinz.ru/files/file/lawuvi.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_off0000b326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB326 14924 bytes
SHA-256: 7c51ff9ff7a3cf6d91992dcb9987d42fbe98834fd675560df2e4ef5c685f43f7
font_01_sfnt_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 9840 bytes
SHA-256: f0d085e6e44dbf470efa37497002a5365687ac8549a6cc8704d42d3ebf5707cd