Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4dc29d61dd156c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 20:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c26db0aeabb596577e14122e099301a SHA-1: 07670551f257e7de5fadf489003289e23a7881e6 SHA-256: fc4dc29d61dd156c768b40271b74eb7c3eeb3775e84d2bb853da80b079bdd97e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://angel-juicer.com/FileData/ckfinder/files/20210904_4A4A3B587D435CC6.pdf In PDF document text
    • https://cooperspick.com/files/2063731645.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109070356137590.pdfIn PDF document text
    • http://www.buildonhope.org/file/kedabegiruragevurifelelo.pdfIn PDF document text
    • http://asvpp.fr/pdf/mipitesoketowutov.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/mirogaxuwi.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/89096762494.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/30776603296.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/92718481526.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210917232254.pdfIn PDF document text
    • http://partnercable.com/files/99221961374.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138730a232a4---97221366307.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/resekinadeligupilewaka.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/95214411796.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/zizepiputabo.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/juzaboxexabibidageweju.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/texevidu.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/66486340286.pdfIn PDF document text
    • http://swhos.com/upload/files/62015500402.pdfIn PDF document text
    • https://badrivishal.com/media/58219832926.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/selekosemexikonazu.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109132247041984.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109090705032377.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/lijusirepi.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kefagil.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/fejorulugedazewafov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mobdro+live+sportPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/75274657263.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_off0000bcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDF 10320 bytes
SHA-256: 266fbf148662648ba6567edd742aed56e74f57bb46f1d732e8086ea4b8764c4f
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 15564 bytes
SHA-256: a468b486f03365aae15f40a6f0b13f0bd79b43c0babf4059bd02bafe14b6c398