Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dad01f0b170709…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 15:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b5fe3be4d0c8cf751932c6c4fa876fe SHA-1: e228cd95f5707ffe977621fabac6a31e640a2c53 SHA-256: c8dad01f0b1707095520072c2c3dbc42af0bdefc6d83c3b459fde249a14ac35f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://archism.ru/uplcv?utm_term=anime+stack+ios PDF link annotation
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/16747647993.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/96602569235.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/zatozexikisivususas.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/30193510433.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/20170681747.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/46987451055.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/67827799814.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/xodivudi.pdfIn PDF document text
    • http://medi-sen.com/files/files/xipakafamanaxanovaka.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef0da1cc2a---jibiniragumonewazar.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/15225875956.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/63118712514.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/tofubagezoxometojusuko.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/sofexugusenebipiku.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/lebakakigiwopejivorusuva.pdfIn PDF document text
    • https://iwistw.com/upload/files/52269296221.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/kelowofebaronamomidux.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161527a07da715---ritivuzixafulapilavu.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/93735168032.pdfIn PDF document text
    • http://scsychem.com/upload/files/dalekaxirudi.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/gapofagitoba.pdfIn PDF document text
    • http://normel.org/files/upload/file/zidupikabivakugakusalo.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/94701605649.pdfIn PDF document text
    • https://thehealerspoint.in/admin/userfiles/file/4440051546.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/62053577167.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_off0000b03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03B 16004 bytes
SHA-256: a2514ee031e3dcf26b7cf8c03e8db488fcd546289bba0b1c382ddbc145340f00
font_01_sfnt_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 10316 bytes
SHA-256: 548dfc68c3c6370ce98dbfc308eedaca1af1b25b69934a5cc83a755283b96f28
font_02_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1