Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca3daaf2d1375fc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 16:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e4f2e2252906644a4eb265ed34f0c603 SHA-1: fe2be4d72b9aadf8db24fc5e2b569402610ce499 SHA-256: cca3daaf2d1375fc8d4c95109141f88e600315e5d8f2fbbcc832be8611c31e12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=best+navigation+apps+for+android+india PDF link annotation
    • http://chiari-web.com/ckfinder/optimist/files/pawirisul.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/57435454979.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///parupukoxenovi.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/kenum.pdfIn PDF document text
    • http://sb-78.ru/files/file/jeleripevowunutesasovofux.pdfIn PDF document text
    • http://olivermilk.vn/tctt/sites/aaa/file/30630369761.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/nefaxeku.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/5443804786.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/nenemudezusij.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/66276225400.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/wisinajateruda.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/7d17e3a5d35c0f44024cf5326ccc50d9/savelivif.pdfIn PDF document text
    • https://anfauglir.com/images/file/15303195052.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/ponaralixizironipupafu.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/jamewobazibosalekozub.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/85456868268.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/wipafipafubezumufozuwulaf.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/53474901586.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/47433636653.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/zegotif.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/9362705124.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/4554049045.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/56457599475.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/puloxefogigozel.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/10080491639.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5dd5e925---76773225223.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_off0000b48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48A 15184 bytes
SHA-256: 6d2e2a232c993ddbcd3d28af4c269b3b8875fe64301c007da54e2bf9454df309
font_01_sfnt_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 10748 bytes
SHA-256: a367b341a400709dc35b6243e142754930cd3ee39e1cad27d4d57811c61c92e5