Malicious PDF — malware analysis report

Static analysis result for SHA-256 d246b252f3563988…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 07:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91f12873cad42d5a5abcc7066ff06b6b SHA-1: 8b4e0e922bf18133de4e973d63ac59b4d231062c SHA-256: d246b252f35639885306a68d704b69a9bd2935bdc9f4efc1a30554e047bd0b57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amursvoidom.ru/media/files/xawoxaberelunixovabupoj.pdf In PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/wezoxexanapegobunatas.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/50209123034.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/rologav.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f5faf7c18fdcdc2d6b868999d58849b2/bafarukoxaxiwuribikelama.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/vexej.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109032132156264.pdfIn PDF document text
    • http://skisun.it/userfiles/files/domoxolaxobanimor.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/62321392298.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/6495538614.pdfIn PDF document text
    • https://pecintajp.com/contents/files/dedidavafukom.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/56500154991.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210901060824799055.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/65675419865.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d3100ee4---wikezavarokalazesodafiz.pdfIn PDF document text
    • http://gysanya.com/upload/file/2109052316248562454l1ugegnv5n7.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/18813736397.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/29347387387.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/bijefonusol.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/19969606239.pdfIn PDF document text
    • http://motty-etai-sharon.com/files/files/zosilut.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/71027580949.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/59520017186.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/vivesonapav.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/60128625546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=videoder+video+downloader+latest+versionPDF 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_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 17812 bytes
SHA-256: aa60332aca4a6021dfbaf0f77e583bdd7a31b369004295e46353e21c0a36cc74
font_01_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 10360 bytes
SHA-256: 92e215fb6a4dc0239b6fded0b6002f3eb7bc582187b59c0e663b0bf14bf8908e

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