Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96c84cdddd5b132…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 07:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 962af5f5f1c9d1248e25cd6c82184737 SHA-1: b5f6bc16530b9cb59559049ce30b46f509b6a334 SHA-256: c96c84cdddd5b132008afccb629bba73a7b54b1988c1ccb679cc38cc0d92468e
102 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, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and the heuristic for a link farm on disposable hosting further support its malicious nature. The embedded JavaScript likely facilitates the redirection or exploits a vulnerability to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier clean score 0.1918

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.
  • 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://inwebjor.ru/uplcv?utm_term=super+puzzle+fighter+android PDF link annotation
    • https://whatshoulditcostme.com/userfiles/file/35877038535.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/70665174892.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/ratejejiveluw.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/gefudetaxumojifusofenile.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/65259348506.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/84106201390.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/nijejikafomudevufegevaz.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/jozakuzozoremobajateneg.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1cd50347---vupumojidal.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/61241230981.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210903_201011.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/nebikomitadoson.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/mamadutanugeroxoro.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/36746439447.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210906095957662.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/49832564832.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/75540230114.pdfIn PDF document text
    • http://toonesk.com/upload/32047143741.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-09-18-08-29-28.pdfIn PDF document text
    • https://manenshop.com/upload/files/gobuvugiwawijigexejujugaw.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/61143222857.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/rebopiwelotud.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/sutelezisarerevum.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/93343352811.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/ziwuroto.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 10844 bytes
SHA-256: d3dcafe21a02864b442522dffa77f74e391792da7053cdd9f00b68092871d57b
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 23120 bytes
SHA-256: 287ad4dd97086944d75262a50a5c4dedd73f986c2ec9c6453a979cb9c7b2da14
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off00012d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000145a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 16196 bytes
SHA-256: cfba916591cec4620593278d8f837f55582504bc2a08443f4091284d0e4bcb9a

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