Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea505d3079eb62d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 00:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20010ac1a87158da457294634526d5d6 SHA-1: f16e8695933b62c6f5f6e705dad923b9cd05420c SHA-256: 8ea505d3079eb62dbfc6122d676848232b3fb37c7269821269769424a54cbebb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=best+roots+for+android PDF link annotation
    • https://purevdavaa.mn/uploads/ckfinder/files/rapesakexeratu.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/tapinujixabozirurerijogaj.pdfIn PDF document text
    • https://superpart.com/files/bogevuse.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/72341531629.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/95213248844.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/45565020655.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/89236406827.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/37656766206.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/71131039344.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/kubuvewulikig.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161402cce2a425---31468707804.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/24697746933.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/33385414142.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/betovexenetato.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/74903069473.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/sulafuvukevobenege.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/pezisakubogorasu.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/devuwubajekamifukidef.pdfIn PDF document text
    • https://advik.net/userfiles/file/6561026470.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/jimavodoxejiwa.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/69313930531.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/10344863842.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/dokasizuwoditu.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/96496312569.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_off0000cb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB63 17488 bytes
SHA-256: 176a7bbea0b6b0cf1c5772b59cc041e2af26cbf0e57c841b957a788e7e6f09bb
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 10352 bytes
SHA-256: 1b7fef4324df80c08bfd117cfdca920545b6c829f044c88f7467380694c0eda4
font_02_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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