Malicious PDF — malware analysis report

Static analysis result for SHA-256 c765ec1b3ef3cf27…

MALICIOUS

PDF

62.3 KB Created: 2021-09-15 21:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce0c9d398d519de54a4817ba67d8501f SHA-1: e1f122854019a375f4040600deda190434690f51 SHA-256: c765ec1b3ef3cf276c064bb0982b90d0fd3e41196cf48358b75c8305653caee8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6160

Heuristics 4

  • 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
  • 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://towa-aaa.jp/userfiles/file/40781893943.pdf In PDF document text
    • http://sromedical.com/file_media/file_image/file/49175797654.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/73012121746.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/80208335135.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/2503809541.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/gopomawimamakaxofi.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/74615047450.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/fobijovi.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/85521764051.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/mubawajosoduzemajamitakip.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/37173204493.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/41767847529.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/89902449871.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-9/20210909052700958186.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/gidotejokazip.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/225592767.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/wapegoxubunamidupaxa.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/33722343457.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c7cbb3b8---luzedede.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/nozazinazu.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/336950869.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac65e0bd6---vopaxiwuz.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/27883381976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+use+android+on+iphonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB995 10620 bytes
SHA-256: a09b221c46e3bd454dbbbe0439ac28201fbfbab90c985d77b298619fde28b0c0
font_01_sfnt_off0000d1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 17108 bytes
SHA-256: 0b3b1a29408e548b95117a630d60e499781960d328e58949e753f1a87c9effc8

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