Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f895f8f1ab40531…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 21:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80066ad1da5d33a57b15d6878c32105f SHA-1: e17651f432a64ff9c5fc3163420059c6ae4d0621 SHA-256: 8f895f8f1ab4053186d95e10ee1e3bbe20b1697c2877bf9a68fb0c689a5f2d8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm structure, suggesting the document's purpose is to redirect users to a collection of potentially malicious sites. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304fea96eb8---58668737831.pdf In PDF document text
    • https://yensaovinastar.com/media/files/zisadupakek.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/ponepireserereduxadatujuv.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210902_063147.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/wawupi.pdfIn PDF document text
    • http://strandedtattoo.net/file/29215546959.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/vakiwajexonijutabijag.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/tuwofolavofi.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/86442900031.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/6345707129.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/xogubilo.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/sufuxovutipipi.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/69797516929.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/62048998706.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/96682231158.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c4750f221df539bb848f1c54e4f259c/29603124755.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/84379905844.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/74408076345.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/85135827982.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99814846209.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210912002713.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/79116344673.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/lovidudoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dragon+ball+z+kai+season+4+episode+19PDF 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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 18956 bytes
SHA-256: f1e79ebdbc6eedaa2e5d18256a9c77d1228ab013506bee812c614b8d8f287886
font_02_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 11060 bytes
SHA-256: 6ac77dd27a597822b0d03cf0c0f820c5c0240b0b27d864344b7ef8abb096f8af