Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc8bb7a8365c420…

MALICIOUS

PDF

80.3 KB Created: 2021-10-14 21:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: abeed24acc4b0674c80b2d6a12b6a373 SHA-1: cf8f4f82bc22f397b6cd46ef624245cc5e1be079 SHA-256: 3cc8bb7a8365c420c0056b602252e1cd0933a86e665b0c7e6ff0846ede42d5a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely to phishing sites or further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely facilitating the redirection to the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://noursportevents.com/wheelmarine/userfiles/file/8942980247.pdf In PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/34429695832.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/74479195184.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/sodegazoxolukunomun.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/wodewolodij.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/79491336445.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/6002627071.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/21837924779.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2157b81d6---xulag.pdfIn PDF document text
    • http://wenxuezj.com/images/File/9223769849.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/mejizumunepavijebu.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/sivadokimugomasefivume.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161384050dcbcf---xorazebegeniwopodubilude.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/fezalexegasomoz.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/tidifatujakifel.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/48791605371.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/tanofaduwama.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/85038056006.pdfIn PDF document text
    • http://koutingchina.com/upload/files/pamavisanetudigemuwusut.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/futuvugikedugis.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/roxagemodurogedefituvi.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/81529635734.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/68202933353.pdfIn PDF document text
    • http://szm.hu/userfiles/file/senakotamadusosivajefeged.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=a+second+thoughtPDF link annotation
    • 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_off0000cf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 10328 bytes
SHA-256: a536376cf58098db202e899dc1ebfb4f686212e52d89fb4cc9d1041c6d9ce048
font_01_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 20812 bytes
SHA-256: 09b99f12d976dc2e182f7d481b68cfa39e65a5501f012f54701a7dc6203e9e03
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1