Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fe37d9e65c0521…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 12:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2238fbdfc9da20e71a6f07d8f4816538 SHA-1: 767bb27dc1d73338d419f41aea8a7801d0ab51a5 SHA-256: b6fe37d9e65c0521d8b402ad871c6fee21dcf64ca2d8178e21cc099c8c71dbbd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a deceptive tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=2021+tour+championship PDF link annotation
    • http://peneleos.pl/userfiles/file/mikanawinalitate.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/xulufezopega.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/nozixegujagilojalud.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/bawijun.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/85065966525.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210924_B329F00CF52159B7.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/13141852077.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/jarusap.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/munuruwadi.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/jewiriko.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/vuwilipunexowogiburineka.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/73504899835.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/sadowafi.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/zuvefiwavefululu.pdfIn PDF document text
    • http://vln.nl/files/file/97902128271.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/josujudi.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/49427965002.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/gebazujukirif.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/digulip.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/juluberel.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/75242168405.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/salomubesesok.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_off0000b023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB023 10756 bytes
SHA-256: 2330782965714ff6b73c0eefb09717ac81cf47c39d58a713f3e1004e470d1f6a
font_01_sfnt_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 15928 bytes
SHA-256: 1d935d3020f7147d7b7baf68bdc041a211dd86a831b0c5476203dc7fda832160

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