Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65e5c4c2e087883…

MALICIOUS

PDF

93.5 KB Created: 2021-09-14 06:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad01c4efabb580aa073c2d252f9e6155 SHA-1: 6449951db2b5e90540a41a7ed2ab7cd718c93555 SHA-256: c65e5c4c2e087883f2f2f0ec64891d0af020c075622d96bc8bbc31269c74d6f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://oniceh.ru/uplcv?utm_term=android+messages+sms PDF link annotation
    • http://emanuelarombiarchitetto.eu/userfiles/files/10869190321.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/46673969504.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/nigidisenexobofa.pdfIn PDF document text
    • https://12shio1.com/contents/files/49283502498.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/59108922132.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/27094825980.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/69826347141.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/xawimimizewadodamotas.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/busidodabit.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/77276716624.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5c1c7e57c954b45b5d93d36158c80015/gatofeguwenumosurojuna.pdfIn PDF document text
    • https://oferta.lt/i/File/38396734426.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/jowulog.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/39210097627.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109121659395402.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/92246488651.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/43497683095.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/16798452465.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/bibexiredikumogupamigimip.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/lomowotabirerudijili.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/8583753179.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/peligodit.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/79571670644.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/69475977871.pdfIn PDF document text
    • http://guchen.ru/d/files/mabigak.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/wexod.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/57754159498.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_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001207c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 10428 bytes
SHA-256: db1d62a98b54ff4be4ed9a9e45eabae8db7abb18a828b08e9375e1e4a7cb680a
font_02_sfnt_off000137d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D8 18204 bytes
SHA-256: 1961cef311837b17ebcf2503f4cc504c1ac995ed16b9557e6c6d52662aab381e