Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e65103d55e6b66c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 18:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1489f3fc28089765e788539648f22588 SHA-1: e37ebc44cf9bf8f44ffca88894e37134efe73027 SHA-256: 5e65103d55e6b66c8898142d9de362fa3e867a4cd90161ebdf8efbde765dfec5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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://nomylo.ru/uplcv?utm_term=moshi+kotlin+tutorial PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ebe5d6105---difixefipenutavelejerebas.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/93077585852.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/kabisobamemiporubemilexe.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/41246265961.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/zusetodibexogafeteterupeb.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/17899976207.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/75872527602.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/8737049778.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/6365765376.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/65607102308.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/98335439962.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/65373393566.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/lazesuxosizawuwafip.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/77537811904.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/tewumiwizulapolafo.pdfIn PDF document text
    • https://olterus.net/contents/files/dakemenataxogatavipaxog.pdfIn PDF document text
    • http://erictex.com/ufiles/files/julenabulosidadogakujobu.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/96406910252.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/kifil.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/15153759977.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/fazasapegenuvuwazajevigex.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/gegazajuk.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_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 10260 bytes
SHA-256: cad0a906074f49a6b90ba072379b6d480d55569065a6f22f152d6e1ca6160bde
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 18408 bytes
SHA-256: d28fa21deb5e9da9c6e9440a111826f2d59bf0826712c0b0cf24747cd07bc415