Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4597f33f637d88b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 07:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d0a62a56da1261c57efc3276b475c5c SHA-1: ad325f592244a99637c2b177091dfe12c11aa2a2 SHA-256: f4597f33f637d88b434a1d05387db2a005e3926f86b9e67459be9afd7731a314
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, with one URL specifically mentioning 'amazon prime mod'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination through multiple redirects on disposable hosting. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=amazon+prime+mod PDF link annotation
    • http://ottomaniantextile.com/userfiles/file/77276171870.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/meriworebosavulozolo.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/polemexejigizag.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/nixexapo.pdfIn PDF document text
    • https://polandpools.com/contents/files/96313551335.pdfIn PDF document text
    • http://origo.ws/userfiles/file/pufatizijakikinuga.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/10734807791.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/52492772479.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/gowunagi.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/97777356683.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3f4199daa7e46933774946674711ec00/20451503793.pdfIn PDF document text
    • https://reha.bg/content/upload/file/ripekafewumuvo.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/28733369696.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gijenugineravexiwipajosed.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210913095923586.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613382e040bfc---newobadituxelofi.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/17995719263.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/52241846650.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/31965690186.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/20553585001.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/340870638.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/kutekenon.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/guvozetalojixaronigufag.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_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 18076 bytes
SHA-256: 0f43ebdb54cdd0a1a4debd805064cc6bd3897cb59b04715078e2ec6d58d8a6c4
font_01_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 10280 bytes
SHA-256: 666ca2b66fea71d200e8314082581295a098dcf931811091c60857513bc3c91d
font_02_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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