Malicious PDF — malware analysis report

Static analysis result for SHA-256 a865452509e8a915…

MALICIOUS

PDF

65.0 KB Created: 2021-09-26 23:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80f66b50d7e3d24264078e5244413ab1 SHA-1: f1dcd0d652d35a7221317147dbdb14a028073361 SHA-256: a865452509e8a915da003ae1110c4a345990a63226c9ad5255c68053122e5729
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The heuristic analysis indicates it functions as a link farm, hosting numerous links to other PDF files on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6032

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://fusen-es.info/yamituki-n/uploads/files/wirinilelonakesa.pdf In PDF document text
    • http://all-premium.com/user_file/files/53773525476.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/70200087864.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/nipako.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/vapagerezet.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/52746134137.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac99e0fb35---mimilatilo.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210902035834_1843729130.pdfIn PDF document text
    • http://aeu.pretty-match.com/upload/files/70997766940.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/xupukovekix.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/25401961440.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/buzoxivapet.pdfIn PDF document text
    • http://cx-gl.hu/images/files/sanexakitovirimofut.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/60735007146.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/wuxixiju.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/29247417202.pdfIn PDF document text
    • http://anpharma.net/upload/files/27452284562.pdfIn PDF document text
    • https://jss-moms.si/upload/File/58100442073.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/13925499604.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/89108483078.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426d79a762d---77900523501.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/11213348025.pdfIn PDF document text
    • https://akemi.ro/hirek/file/fujiweta.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/fimet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+extreme+randomizer+rom+downloadPDF 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_off0000aeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEB 10580 bytes
SHA-256: 361ca1c41b83b569157ccbbc08cd14b51cde4b1516522812436c5461514152dd
font_01_sfnt_off0000c71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71C 16336 bytes
SHA-256: 1ebf1d4d5f54817177fc5a608161e35e3135e4f935f61e60a6e0fba153399eac
font_02_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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