Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2814b814e7028a8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 19:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 244234bde855aadd11f76ba686aac2c4 SHA-1: 6299f702af21a3c8f2325d23ee196a1f68c21cd3 SHA-256: a2814b814e7028a8721b235498e6e29ba1f9f2919ebd8625a7432d1adef68470
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a larger network designed to host and distribute malicious files, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nguyenthaotech.com/upload/files/95386434706.pdf In PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/49906428354.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/renevabateboji.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/xagetarodafu.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/44924616285.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/vowutaruxafowamuwi.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/693925472.pdfIn PDF document text
    • http://dytac.hk/userfiles/47737452995.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/25068076405.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/makemuxaritotuguroxejik.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/xisizuraj.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/53984801296.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/49949930495.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/34202473550.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/82054459711.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/322811529.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/72355397333.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/30675071504.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/bijamuripesazuxez.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/38079099710.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/71392780139.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/wafororefane.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613203331e64e---natopebisegonuzoveki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+first+hokagePDF 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_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 19360 bytes
SHA-256: 6bb899429438e15c0283b47dd1d70ba90a6ee744c4c1bab3c83b01866e307a54
font_01_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 10400 bytes
SHA-256: 57b6e018bb3d9f6f0ac18bc90499b8d18e119d705dcceada925fc433570d72e0

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