Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5ffed35901566c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 19:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 394a9e78ba21e07104c3bd9160e4dfe1 SHA-1: 34ffedd322782775288d9f790be57f6780a5992f SHA-256: 6a5ffed35901566ca2bfd67635ba86f9ddaa23c2e41e925802e83661ddc70f92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=escape+plan+2+hades+full+movie PDF link annotation
    • http://vertracapital.com/uploads/files/vamowexajatexite.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/32253342414.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/kemubekop.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/25019748616.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b832f7488f---90328839002.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/sulofavimose.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/darot.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/vifezutopikisuteduziwidu.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109112347213778.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/wevibefigujo.pdfIn PDF document text
    • http://strandedtattoo.info/file/vogorumumojalere.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/rajanogovetikax.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/87693268453.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/90972047415.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/lufuvisudulegopejeso.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/megozunowamunizax.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/9361590734.pdfIn PDF document text
    • http://mfahk.com/upload/files/90729142531.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/senuja.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pozununugumafagagop.pdfIn PDF document text
    • https://olterus.com/contents/files/kuvofasanir.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/50701555882.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/45171535703.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_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 18064 bytes
SHA-256: 12ca3353ed5079302d2432febc318b638e2afd08423dadc04db1f85c4bc3bf6d
font_02_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 10956 bytes
SHA-256: 376f4257c3cae13487c9cee8500dccf0ea2737df662200544a84784c4f3df07b

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