Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f7d1dec7e3288a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 22:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba21ca4b3dd937b68a376e8e30822246 SHA-1: a5aacd2b44c8cc169b5c522bf8d7b085f5b3b508 SHA-256: d3f7d1dec7e3288af23cc893df21ec7d83098e8ea48ef88f8b17871fa1599653
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially malicious websites. The PDF structure suggests it's part of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=bhagavad+gita+as+it+online+free+download+pdf PDF link annotation
    • https://exam10.menapoint.com/app/webroot/upload/files/32617049394.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/befopapisipiwapitunegesip.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/35138783435.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/53087671596.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/30127313584.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/67320298518.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/75962941765.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/dobef.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/bezim.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/derozanibitebisapexo.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210909_F3F3278CEC86F48C.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/natamolikefuvalukirasesi.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/fegojibuvezejunezaz.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161336aeb59493---suvowutovemopo.pdfIn PDF document text
    • http://prmakeup.com/Image/files/vavexew.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/lozekawunurugizonug.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/merufixojotaname.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/43789381554.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/88530891212.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/36748663888.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/suwiduzisiwutud.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e375753b94---mukar.pdfIn PDF document text
    • http://www.bash.cl/media/file/vukipanupase.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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 10980 bytes
SHA-256: 019724ad30b6a94afd934c7fb8c095c27575fc2f963c90cfafd9421c9374a1e3
font_01_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 21140 bytes
SHA-256: b9707f809499870e33d93c0cee5ec61d0522d3864f63172419ffeb3bf1956c9b

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