Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c95d1f19109178…

MALICIOUS

PDF

72.1 KB Created: 2021-09-23 19:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 436ada98c0e37014db00dfc6da47e598 SHA-1: 0c4916728a41c76505be3f7bb5cf04e2ccb22471 SHA-256: f8c95d1f1910917880422d50c18e89b59a98bb8136679a8c2af184de92a203ed
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the numerous extracted URLs suggest the document's primary purpose is to redirect users to potentially harmful external sites. The presence of multiple unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5207

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 http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f808c767c1---36821566252.pdf In PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/22162655716.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/nopinofud.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/20725096596.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/mapepemoketevusujezebajab.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/vibopatulilitaluvejovabu.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/51840824027.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///98991310570.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/gitozo.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/66667045789.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/37179722013.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/wulalus.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/bosibesobura.pdfIn PDF document text
    • http://maidichike.com/upload/files/wowib.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/18210122537.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/wiluki.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/38409273786.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/xokeroki.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109140045101817.pdfIn PDF document text
    • https://angkalaris.com/contents/files/pisowo.pdfIn PDF document text
    • https://hgb.se/filer/file/marafonodepapo.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/47070801428.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/98047364693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=injustice+2+android+apkPDF link annotation
    • 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_off0000c6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 10856 bytes
SHA-256: 1c8941e5c1cc083425dbf0bd76d86510bce665fa022a79e3537df2016889568e
font_02_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 18608 bytes
SHA-256: d0297cb40825a9b661e6ac079ce15a0dbb918a420cb9b1792308e8047aa35201

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