Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e20da5f53d7641…

MALICIOUS

PDF

73.3 KB Created: 2021-10-09 07:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a03af7328fe520580fc71c01327c3d4 SHA-1: 34fd8a6f43b89683fbfd1f83d3d09f50fcb0e379 SHA-256: 10e20da5f53d76417beff92f42c7fc231590c2442bdf716e6f4dd076a96453f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs pointing to external domains, many of which are structured to resemble file downloads. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a deliberate effort to create a link farm. ClamAV detection and ML classification confirm malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure strongly implies a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=european+assets+investment+trust+share+price PDF link annotation
    • https://shirbandifelt.com/userfiles/file/wagokikev.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/mukupadubuto.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/95231963431.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/55759425616.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/budekoxivowudesazi.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/sozuvemosumidero.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/68505048279.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/jamafizobegaratojafubafox.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/fupesuduwamixadarujuw.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/7368876737.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/wenaredolajatixur.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/pewafirilimamanuf.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/10110030298.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/24891258656.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/20303740437.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/71950380752.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/lapizejukiva.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/64552053060.pdfIn PDF document text
    • http://njxinbell.com/upload/files/97658305328.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad1ba3d6f---1205089842.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/memovefovijiz.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/49414451374.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_off0000ba10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA10 10740 bytes
SHA-256: 2694445d706ab346adb438eaef36d42daebd707df9c31564b06e0e69052d54bd
font_01_sfnt_off0000d29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29A 17496 bytes
SHA-256: cb3193fd284164a72392379cef46378e17951488d9e02f582d595b8d0ed8107f
font_02_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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