Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d623646eadcc54…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 10:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3dea0774989a87f9f93b8f7da2b62e9 SHA-1: 447b524ff959fea04595ac7fe9aa936ccaa2dc83 SHA-256: 85d623646eadcc544a38a0e579078b9616b3bc16a695734edababec26f731cd4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm with numerous URLs, many pointing to disposable hosting, suggesting an attempt to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161360324ee993---26361755881.pdf In PDF document text
    • http://teranor.com/ckfinder/userfiles/files/25984427923.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/18113900850.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/bedenan.pdfIn PDF document text
    • http://skolky.info/foto/images/file/87563471790.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/nisofonujibaponalevon.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/tavipitexobewafife.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/xugob.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/petipenozokikituwoj.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/92940723987.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/vamofoka.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210908100301.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/42495586211.pdfIn PDF document text
    • http://dd-eng.com/files/files/32641006590.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/tuvetededazaxigakedal.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/60963558416.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/walepotazorebenodafo.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/bivera.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/89517330868.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/siveduv.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/rujuvugawizunup.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/86942386268.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/pekexaruvotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=xiaomi+redmi+note+9s+wifi+problemPDF 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_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 11060 bytes
SHA-256: ac097437a6151826c4f2200b152221183d412262cfcf2426e3670ea0940f49a6
font_01_sfnt_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 17356 bytes
SHA-256: 0e217ea836c77818f97d8f4a5bf538139c4d7536433f031ab963dfd63930c3a3

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