Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fd891df66f070b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-21 12:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86c38407bc0bf39f0aa9824421ecf87c SHA-1: 095dc300e76d818d78cbb1727f2eb7069d709c85 SHA-256: 98fd891df66f070b1e9202380ec6564962be3e8d3565b4cef103f10b581fe8d8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic confirm the redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7752

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://inwebjor.ru/uplcv?utm_term=my+boss+apk+ios PDF link annotation
    • https://makenie.com/upload/files/bezejijil.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/92411681429.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/sazajeramaxewog.pdfIn PDF document text
    • https://intersat.lv/files/file/67113637875.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/6090706910.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/90497021849.pdfIn PDF document text
    • https://akconta.com/uploads/files/terixisarigivu.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/32570055834.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f945d42cab---talab.pdfIn PDF document text
    • http://gibisch.biz/files/files/79865053297.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/33959125118.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/29946279472.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/41131891076.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/10215897788.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/72545726621.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/79500800435.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/91578409355.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/gemotuvupokunel.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/17184258655.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/bupojodogujudobime.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_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 10104 bytes
SHA-256: faa8b50dd211045ca26c08893b8f42f0ecaba7d7fa70191357eb5d60d28fb89a
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1