Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de8d96041a911a3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 06:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cdca5d642966b386960f563151733221 SHA-1: 6bb94ee38ff14934efe994ac90702c479dfb9445 SHA-256: 6de8d96041a911a3bc2e69c67b28060416d8a40a8a98f931d1c634e163c9fc6d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with one pointing directly to a raw IP address. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of links hosted on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6770

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://majubesar.com/contents/files/zowimafilagebopepaluzed.pdf In PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/fapodubaduxoriton.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/54262799398.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/71096265693.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/xiruwuminufusoje.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/70168958166.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/noforunetivovora.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219414230.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/wuwesujima.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/41469051432.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/jofesugidepivuwogusir.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/67530673613.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/83989461137.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jukisa.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/2356040491.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/rejukawaxuna.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/sijiwikededepepesup.pdfIn PDF document text
    • https://inarsindbari.org/uploads/wobenat.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/98136088614.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/favabozuroligopitu.pdfIn PDF document text
    • https://izr.fr/files/lewinamamubaxemut.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132616fd6581---litufupiwozeferakapured.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/fapivasadivitosapitetepin.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+tv+alternative+launcherPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 18652 bytes
SHA-256: 4ca16cb1c91be64c8c86d041ccf4efd7a9b3e9304a9cc3992b1ea787ebf5c5b9

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