Malicious PDF — malware analysis report

Static analysis result for SHA-256 7924c27e92c6700c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 22:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfa665942a068924c24acef26b7b2bc1 SHA-1: 78b06781f0b5a0b3e208c11b52719b2f998f0e99 SHA-256: 7924c27e92c6700c0649f219db4f54e8cf3f9c5b52e231d0a64f96336a4a3a87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161466c8e42267---43625666059.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/bemen.pdf
    • http://sjhtractor.com/d/files/bofuzinolip.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/59483210644.pdf
    • http://www.themixchange.com/userfiles/files/10602102503.pdf
    • http://educasters.co/ckfinder/userfiles/files/43281182859.pdf
    • http://girisimcilikproje.com/resimler/files/76775492474.pdf
    • https://perfecthospital.org/ckfinder/userfiles/files/tasuritowo.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/manabetewonezov.pdf
    • http://greenvisioninternational.gm/userfiles/file/fojalejupaluxipiramumepu.pdf
    • https://smartech.lv/sites/smartech/uploads/documents/files/5573808527.pdf
    • http://sevimticaret.net/userfiles/file/68603552842.pdf
    • https://krainaogrodow.eu/zdjecia/fck/file/tomowumesenozetesujed.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/66161608552.pdf
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/wemurawutezetoz.pdf
    • http://peak-experience-europe.com/images/blog/file/vekurovosiruxetevugefogip.pdf
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/mavegozugaziduzid.pdf
    • http://lse.hu/userfiles/file/2116134803.pdf
    • https://stcc-sa.com/motakamel/Ups/files/97415943912.pdf
    • https://satellietgroep.nl/userfiles/files/17774798881.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/25588719776.pdf
    • http://shanghaicruiseparty.com/uploads/file/83655133045.pdf
    • http://446888.top/userfiles/file/51812994393.pdf
    • https://episcopiaoradiei.ro/files/lerowa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+clear+history+in+chrome+mobile
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 16792 bytes
font_01_sfnt_off0000df79.bin
deae5c1e7c668af8860d9b919c53d2cd211ed8f358607f40b108777b698c6b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 10828 bytes
font_02_sfnt_off0000f84d.bin
c53576b5ed776b5ce2a5599067a91ef031f338f7282334f939e3a0502750c6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 17424 bytes

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