Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd63a6ff93477876…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 18:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cbab7fa0dc01e0ea1302a3a7b1906f7 SHA-1: 732843c481f738765c8fe7260a084bd85423dfe4 SHA-256: fd63a6ff93477876a107f10ece3ec981643d26a6c3f335b6892a46694c8a69d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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 https://inwebjor.ru/uplcv?utm_term=pencil+rush+3d+mod PDF link annotation
    • https://burlingame.com/wysiwygfiles/file/nevivigeduzigeme.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89914097164.pdfIn PDF document text
    • http://watch62.ru/files/files/regezagututewaboge.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/kibujugigijav.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/zuxovo.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/wuzorirafopupinugubimax.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/80638850470.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/keredomezavekigiv.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/41646835209.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/83172835987.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/85186981583.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/kugebekoboz.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/22382316492.pdfIn PDF document text
    • http://iccarrentals.com/files/file/36270633568.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/49322612142.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/vuxeze.pdfIn PDF document text
    • http://hotstamping.pl/files/file/pogakelajuxemipub.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/setesidujoxorunivawole.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/xowajurexeromezenewi.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/supexu.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210905_7D8523DEC1E1F7BE.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/kefixo.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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 18932 bytes
SHA-256: c54c4210e0ff17f9941750e3a0732e654457609516c4acb01282963bd369d1a9
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1A 10648 bytes
SHA-256: f8e0b95916e8e02b4c17750713225f4db9f5ad3ee481287e43cf5c30c82c55ae

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