Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d05255b4cff1798…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 01:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b1f21745253199dbbeb0a514046328d SHA-1: 3b5b2b26b03af3ba2b3d645eb0673b1e976f7b5b SHA-256: 6d05255b4cff17980fb8f90d4d53c86fa215196bbfdd74fb0cbacf7afc93e8dc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a lure or redirector. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

Heuristics 4

  • 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
  • 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://wastran.ru/uplcv?utm_term=printing+from+android+phone+to+network+printer PDF link annotation
    • http://land89.com/ckupload/files/woropunarafasaju.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/detomegezetu.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/57874906299.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/derufuxazin.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/615581798.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/lezosovoxafi.pdfIn PDF document text
    • https://ms02bet.com/contents/files/nuwopurizosukotuvemato.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/faragowikizeniwo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00b0af9e9---miputuluvo.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vedosemotuwudujobeberi.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/sabusekijotuzadadu.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109130612204668.pdfIn PDF document text
    • http://planetamama.ru/files/file/fuxerelevud.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138865f8f5b2---nisinifeg.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/64654529456.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fobegumugilotubalev.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/18984567800.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/kugap.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210916_053549.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/25232438021.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/xarokisisinidis.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/83666692887.pdfIn PDF document text
    • 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_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 17620 bytes
SHA-256: 5f016a93f2ccb2babad8915ecd4ebf5f9db4d5fbbd036021c5e13381b1d34614
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 10912 bytes
SHA-256: bb0b51084b4339c308056ab521abc5961922a137c7459cb010f14d1d9e04eb86

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