Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e47d34ad012b6f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 16:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 035b6648cc1563fa633cdf2d5154f142 SHA-1: 2463404699d412395c92b0ae63ec39bb62c6b95d SHA-256: 36e47d34ad012b6f76c740cb8d5c0184b0c0cec5d7166394c3918d50fe1439e5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of distinct URLs, many of which point to disposable or unknown domains. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt, likely using spearphishing as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7562

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 https://miaousland.fr/ckfinder/userfiles/files/mezelafobatabotefavimex.pdf In PDF document text
    • http://artediapharma.com/upload/files/82533098072.pdfIn PDF document text
    • http://identik.hu/editor_up/beliwin.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/dazifufux.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/94533360717.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/mokujaxiramebotaditoduj.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/lodageradedasolu.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vigogubaw.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109161514334708.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/xitet.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/26358415512.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/82427700004.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403bd302166---28215164905.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/rodipejepanisekimoke.pdfIn PDF document text
    • http://carbonelite.ru/file/dutafososirawolasosavami.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/rirefu.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/98926006760.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wadefemipezejupudevanun.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/13664389369.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/bapar.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/buwototazomisinu.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kipetuzejatonuw.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/37240106149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=flight+apk+modPDF link annotation
    • 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_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 10404 bytes
SHA-256: 44db244d15b8b3d73fd319e22ae88e5bcc70c565c787de64ae7a245bddb3738f

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