Malicious PDF — malware analysis report

Static analysis result for SHA-256 263057411b0f6094…

MALICIOUS

PDF

69.6 KB Created: 2021-09-23 23:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c2aea6c38a87e7c202ec8f009419715 SHA-1: 156fa592de4fc641b98d53ba924a22a52c506f03 SHA-256: 263057411b0f6094a0f07d7f5e180ae0fb02a3b425de538a27e46d9fd82e0e2c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to potentially malicious PDF files, and exhibits characteristics of a link farm. The presence of a 'download button' heuristic further suggests a lure to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/43ae23d4e55fc099a5eda18581aa05de/6231769502.pdf In PDF document text
    • http://daoltrading.com/userData/board/file/bogedimupusufegabutuxe.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb51ee8aca---widetatap.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/jinegawanafikupixowijeva.pdfIn PDF document text
    • http://oilspecchem.com/files/nonuvidekozusunon.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/sotij.pdfIn PDF document text
    • http://lex.tj/img/file/46197006683.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/57119449266.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gibugerivovemexer.pdfIn PDF document text
    • https://gangnampools.com/contents/files/66477447031.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/fotaravatosuzofedojitir.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/1388180286.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///71989521631.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/60817493545.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109160721056292.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/82819809227.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/wovudozoxipoginugofaj.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/fojavepilumexuduwoj.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/kirewomawu.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/16125174997.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/25933377766.pdfIn PDF document text
    • http://ppp220.com/Upload/file/97718627368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=live+football+on+android+mobilePDF 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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 10512 bytes
SHA-256: 73bc6d60dea634a96ce7116df926d38ebe1ba414ca81b70868393c0a5368633b
font_01_sfnt_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 15636 bytes
SHA-256: 3d5f87a049e9c0f66c436a824f3007f5c252368286c75ac771990bcdd9f50958

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