Malicious PDF — malware analysis report

Static analysis result for SHA-256 d041e9a05d8ce51a…

MALICIOUS

PDF

141.0 KB Created: 2021-09-17 21:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 61d2b775f6e9a96833b1e4479500bb6f SHA-1: ac3e5f3fe5f56cd8f56c2e5dd7187ea2aaba884b SHA-256: d041e9a05d8ce51ac8a9b43c0d309d6c548671d464a114c454ceb38b0d03b17f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://drafthe.ru/uplcv?utm_term=%C5%82owca+android%C3%B3w+recenzja PDF link annotation
    • http://balade-pierry.fr/userfiles/file/55184938639.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/kevusevadi.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/ledib.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614396331886e---82352935045.pdfIn PDF document text
    • http://asid.rw/userfiles/file/40971502791.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/bewolimezoviwibitu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/23703257567.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/17447821896.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/geniwutotaboribozibog.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/guzoru.pdfIn PDF document text
    • https://fuoriscena.eu/file/pojusukirugatavovubej.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109010501308907.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/rixabagumegurofelonok.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rifube.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26776768456.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/ranisamilorajaxugufolo.pdfIn PDF document text
    • http://climtech.com/files/files/15387023722.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/61296214860.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/98895909645.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/90891060256.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/29095991495.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4a02ad288---wezexeresikamibudixaxo.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/55472269311.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/70552642352.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/78885928268.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B27A 10448 bytes
SHA-256: 12ff15702cc407317bc5717923a2ca5453aeec66169149686f5653f8e8091cbb
font_01_sfnt_off0001ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA06 2920 bytes
SHA-256: c17877260db7fc9f20a76d9f4c2cc1daed7bc693fa7d77c860e83037382f9b75
font_02_sfnt_off0001d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE0F 21068 bytes
SHA-256: d1317201c4744df5ff98d0e7fd82f035dcf4b9f6126e610f3d89b8ac1df5d88f