Malicious PDF — malware analysis report

Static analysis result for SHA-256 603b3026c1f39dfc…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 11:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b79d280806cefe52e25b0b47764009c9 SHA-1: 334ad7a1a37b30a4390b4e5efd81c13057516693 SHA-256: 603b3026c1f39dfcd08ce0ca28adc16bb98d273f9cb5594aeafa63e1307004e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many pointing to PDF files on disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=uninstall+chrome+update+android PDF link annotation
    • https://thegioidongphuc.net/ckfinder/userfiles/files/mokidaw.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/57494849611.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43117020442.pdfIn PDF document text
    • http://aa-nusd.jp/xojikikidij.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091604342270554.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/mogijujupitikij.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/vazixumifelurupusegobili.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/65474855348.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/gutakoxevav.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/jokixasilulogibiso.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/zijupifojijefenudikudigux.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/denimixonivapezajaw.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/40930410608.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/8978500992.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/29185571117.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nejoxanokuzubemajadudugi.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/noweposowefobaxavadegupe.pdfIn PDF document text
    • https://dcimx.com/files/xojamiwukize.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/24069066107.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/gexoj.pdfIn PDF document text
    • https://paradigma.bg/uf/file/9201163243.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/48691645631.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/jesezomibipirerizimixuz.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/k8e2b99oi1s5a88cjaldg9hfdi/zababowofukobugamus.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/kuxisazagotedixamiwo.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_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 17368 bytes
SHA-256: fa3dd0defc0f9df78e7723ee56b8b97cd99735349fc80af0655fe8a79f2fe364
font_01_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13765 10888 bytes
SHA-256: 172deac4bef9151e9a7bbe1534351edb40ad7d1056eb6e312217b1f5d2bf6a0a

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