Malicious PDF — malware analysis report

Static analysis result for SHA-256 772c2bd6325dc73f…

MALICIOUS

PDF

83.0 KB Created: 2021-10-05 09:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e8b4bc3200e1a2187559c5f8dfbf9f7e SHA-1: 7e81c47414268fce3b6d9ed1a25fab3d82b196f7 SHA-256: 772c2bd6325dc73f04b235216fac88aa60639b361c1de4ec08406ac490788b43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=swiss+skydiver+racehorse PDF link annotation
    • http://mientaytourist.com/uploads/files/45630032453.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/butidufegafuv.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/melejesu.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/dorojokinufoseze.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/213d3cf1643b9ff489cab91c84781a55/nalonufutifidopirakufedo.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/tipalaluxerogotokux.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/mekuxatinebodamamanugipez.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/kegiwebujipiliwigirefobex.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/bevizigezikas.pdfIn PDF document text
    • http://kezheng.net/Upload/file/sokovilupuvuposotil.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/85253376325.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/45426175147.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210908_6A3350B8C5E6FF5B.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c2d8b735f---birepedowiba.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/66532213710.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/kusazazuxagukowurap.pdfIn PDF document text
    • http://elsped.hu/files/file/70951144746.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/fikasekave.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/90393631574.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/91943213324.pdfIn PDF document text
    • https://medpressa.ru/files/file/lewazabotiwavurifigubu.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/36241957804.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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 20592 bytes
SHA-256: 3e62c6b82c356db048e5eae79953e24b547ccd3a0a4a5958e840fc6b510cc82a
font_02_sfnt_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 10652 bytes
SHA-256: dd1a253fc9ecdc8e08e0e9148401a40708d4c2aebf6b34e2e1b735e5e6e1e270

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