Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9445a2c91d561b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 22:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85089197f3929575d9fb6eb30dcc2a22 SHA-1: 0ac18f72adbc81acb1d080bd4ce5086a825ee3d7 SHA-256: ad9445a2c91d561bc193adb09103aa151356a9d46fa59fd8ff1947f22a711318
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with many pointing to distinct hosts, indicating a link farm or phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure and heuristics suggest the primary goal is to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 4

  • 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://buonoantonio.it/userfiles/file/depoteziterovotafigupibuv.pdf In PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/66900663635.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/82618520280.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/jinadezadugusatovenoji.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/maruwowefasuwir.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/detegutominexijufaza.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/62761314716.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/dupexaxogaj.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/biridotidemexerax.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/tawuxomokomotudufot.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/38810925770.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/33203273717.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/13515105964.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/95127129668.pdfIn PDF document text
    • https://bunianco.com/other_files/File/99932631074.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/ravis.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/vuzufekuju.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/dazamatawis.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/91748754281.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///82850054840.pdfIn PDF document text
    • https://digireg.si/upload/losusodulelavubij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=3g+android+mobile+price+listPDF 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_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 11072 bytes
SHA-256: e25f2ba610dc5cf38c5a43efb549bbf11ecb276edc9997592a8c23d93d8c8844
font_01_sfnt_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 17932 bytes
SHA-256: 94c7eeee5f731c394746ea8b5ca9ee435a22c8a1517163a6954cd17455dca276
font_02_sfnt_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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