Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb631482933211c3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 23:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d29c01cfe1b2b3aa502805f65399239 SHA-1: fc14739333f5f16268506b3fa7322fd75ca79707 SHA-256: fb631482933211c3742bc0b1d463800a098b893c4585a5be37d546ab8d2c661f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the sheer volume and nature of the URLs suggest a phishing or malware distribution attempt.

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 http://arredamenticucinesiciliane.it/userfiles/files/45780298649.pdf In PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/63098415847.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/27938902991.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63476392413.pdfIn PDF document text
    • https://bauarch.bg/files/46318998238.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/funomovefam.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/91010058887.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/1728549974.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/gefobapakifedezisaro.pdfIn PDF document text
    • https://cardolf.ro/files/ludisiwixux.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/pekexu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3b9a10ac28a1f3ee38358446796f9bb0/kelojiwoporujud.pdfIn PDF document text
    • https://tivicom.vn/upload/files/fasepabopogurasibifotemox.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/rejurijowepotumubewo.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/linupajodorosivoze.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140c3d9db263---vebifasonosegotekipogu.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/xebetotavafimij.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/fiwonebizixoba.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/dawobabunaba.pdfIn PDF document text
    • http://sbcnepal.com/images/file/jerox.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82136955998.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/parabejugutusogedipagusib.pdfIn PDF document text
    • http://vlajamo.cz/images/file/nilumuxujuwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=norbert+elias+the+civilizing+process+pdfPDF 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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 19116 bytes
SHA-256: 26e2d5a87a225edc53568fd45e5507db7478819559bde0626a448840f46f5987
font_02_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 11140 bytes
SHA-256: 3cf914cea928165e95451efd29cde61a5ffd89661326a414437e3f835ec784b5

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