Malicious PDF — malware analysis report

Static analysis result for SHA-256 2720243a8982b26f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 09:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 131449fe3c6a93aa3203a60b3e11ba5d SHA-1: 9de7833438b8ba6bd5afdd7ca89bcf3211d65d90 SHA-256: 2720243a8982b26f71eccf75cbd8a732bfe3dbef7be1fd6d9e9d614e54351fdc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://bige.vn/uploads/userfiles/file/wepawos.pdf In PDF document text
    • http://tcihk.com/userfiles/lukejolexonevonimoxiru.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/webelib.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/35565220978.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323ba19ecdb---funamalezep.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/62847315003.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/zoleketivezuliwuvuka.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/26053799090.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/89181976877.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/vesuzide.pdfIn PDF document text
    • http://saaretravel.ee/images/file/47674590158.pdfIn PDF document text
    • http://dmkert.hu/files/file/lizuve.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kibodi.pdfIn PDF document text
    • https://suksesunited.com/contents/files/92944592279.pdfIn PDF document text
    • https://sambelteri.com/contents/files/88450258056.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/nikumopotisovenola.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/62188609252.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/64429433505.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tovari.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/41546a8986a686ea793417091df4937e/29355338135.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/28652007056.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/rikirulutulanozubebep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=big+tower+tinyPDF 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_off0000b014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 10160 bytes
SHA-256: f2f5c4a43a15924fb39c6963c82e1ba7841230230261223ad30a738bba79679e
font_02_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 15908 bytes
SHA-256: 331f0421c5cee2a7919b38b3bfba783895832b46eddf296a2a06143df89c6a78

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