Malicious PDF — malware analysis report

Static analysis result for SHA-256 717b35c1146f240a…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 06:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c5803720143e25109b585eea25616d8a SHA-1: 46b65b550f0a9f53489f425f9cbbae0f24f51c7e SHA-256: 717b35c1146f240aaf761e5227cb2354cb6b09caf903191ff4ff9f15179e1608
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8854

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://archism.ru/uplcv?utm_term=zero+to+finals+medicine+book+pdf+free PDF link annotation
    • http://murito.fr/ckfinder/userfiles/files/zexesezerigu.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/kajumoriluvagapovakoladof.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/89509247415.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/wamedajuku.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fd8c82f94c4cb493c8e1f39615b8226c/rokaki.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/44676661827.pdfIn PDF document text
    • http://zeci.nl/im/image/39450050948.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/55873686400.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/pojogomedapiva.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/mixojifinavuvuw.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/gajadiwofas.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/31201705698.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/popasuzuto.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/pivuwofelifasokifibor.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/16689088686.pdfIn PDF document text
    • http://djapm.com/userfiles/file/xakebux.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/22156594409.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130f775e1183---lebenuwadetob.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/58070930008.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/voleb.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/lenanekosotifebaxewu.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/60141564501.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_off0000b71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71D 10976 bytes
SHA-256: 7e2249d4ba47b7bf2ebe0ff89c6799a5405f228a53e7830eee6e90b9256eb8fb
font_01_sfnt_off0000d05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 19472 bytes
SHA-256: d1ba010e48534e52be7c4b7b839572f09c2e300408de9fd9da12870b58356acf

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