Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ecd878ce75487f…

MALICIOUS

PDF

72.4 KB Created: 2021-10-04 08:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5fd0a23b3bf370abc16faaf03fa202b SHA-1: 1fa592039ab8f53c48e4cf6a50fd73a8c4b4b0bf SHA-256: c8ecd878ce75487fcfa900edae1b0e6fe5fa6438ff7c1a27e1e277fbffc72133
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which appear to be part of link farms or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=expanded+form+to+numeric+form+with+decimals PDF link annotation
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161556485bbc06---lewapubamopetegasige.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/77694774158.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/33495332210.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210908181634.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/xuxezulefug.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/lobalidopufesiwirijonetat.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/33380452090.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/51345181679.pdfIn PDF document text
    • http://stefani.cz/fck/file/74603640013.pdfIn PDF document text
    • http://polipack.ru/content/file/debikuvowepejubovike.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/89936558238.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/nogikefevud.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/60075040312.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/lalifoxaxobosij.pdfIn PDF document text
    • http://eichler-kammerer.de/kewifizuz.pdfIn PDF document text
    • https://makenie.com/upload/files/48490507364.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161323c76b6de8---50360294489.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/42373144296.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/31922822800.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/17290891073.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/30030844371.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/xidivavefonaso.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/getokub.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_off0000b60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 11156 bytes
SHA-256: 02ee08e602a22bc68fcce80d01d8051dae428e70fc2fecf6f52ffcb8a99b9d59
font_02_sfnt_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 17204 bytes
SHA-256: e7917c216a4c6c39f5ef349b7f2062a7bee8e0227114a1603d3fc7e2860cc5bc

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