Malicious PDF — malware analysis report

Static analysis result for SHA-256 696a490fecd7d7bc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 07:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d12b4f630f5ffa4515dd01d5fbb3831 SHA-1: 27034bf4d1eb83d07897ffe361940db9020ab947 SHA-256: 696a490fecd7d7bc900b9a3d52ae3b82e8fcc87b3608b3f60c62ed700d667853
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=flutter+esc+pos+bluetooth PDF link annotation
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/pivivo.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/bixutetevupijakaxopatu.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/taguginawil.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/jejatenefefemuvukapaz.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/bosigaduganewegeje.pdfIn PDF document text
    • https://rubfila.in/files/file/77297745951.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/46272516580.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/33582471898.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210920_213129.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/20195807047.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/pidavasotegafobi.pdfIn PDF document text
    • https://botroul.be/uploads/14335430565.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/36415424875.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/jawipelaxewusorapufa.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/26735957909.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/78336405244.pdfIn PDF document text
    • http://vit-physio.de/file/52735082338.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/wifosunonogawi.pdfIn PDF document text
    • https://datajournonepal.org/files/5446336279.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109061146573205.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/50351455882.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/zevaxevedobenufepifevudew.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/bokakakabomet.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/tubik.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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 19892 bytes
SHA-256: 6765c774b64e8f0105aa95b6fc8e006e53935008ca74c7655d463340522df49f
font_01_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 10332 bytes
SHA-256: 2d12b65cd7d7245e360d67d69a00b914c62c00ee5e900014d011b4e3309ded72

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