Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca297ee27d62f981…

MALICIOUS

PDF

74.0 KB Created: 2021-09-11 17:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15536cfaa9514c38c11315302cff7d9b SHA-1: 359b242eece85d8e75a79aff431020f0f519a83f SHA-256: ca297ee27d62f9815153a9fc76ae98629b5cc4eae0b1e6e82b99179b3e95e7c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous external sites, likely for phishing or malware distribution. While no scripts were extracted, the embedded URLs and the nature of the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=lep%27s+world+3+apk+download PDF link annotation
    • http://parejalecaros.com/adjunto/upload/fck/files/xujuxedekomi.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905131829_fvf9sa.pdfIn PDF document text
    • http://effektfilm.de/files/file/kuwemegemesax.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/suwoxuluzalofakuvaxop.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/kiwigamadatawuxawitaj.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/1908621789.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/21926126926.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/46483866036.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/temadelaruxer.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/69165882270.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/rafadibumivid.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/24074174294.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/1557260355.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/rupupejejavako.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/tixamum.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/jasitejosobabe.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130854de868d---57039739911.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/boxeguvewo.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/puseliwimeso.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/27815722345.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/zavavilakiwamawenir.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/jarobuw.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/giwuwolas.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/489168089.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f261cba0cc---71187394794.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_off0000bb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 18252 bytes
SHA-256: 11139f70eb64cb79f526df5cc6984672d35d0678230b42e1f66d0bd247f7a3d2
font_02_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10536 bytes
SHA-256: 7fea97eeb06bc710f38613a8fa89394aecc64a2a48e49d3adefc64664e207566