Malicious PDF — malware analysis report

Static analysis result for SHA-256 118346c87f329c7a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 10:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 050bf656c57ed3ed9d8e46c6fad5e21a SHA-1: 30d0d3eb972e945440432bee5bc570bcf2a0b512 SHA-256: 118346c87f329c7a1cd549ca08f8c22169b1ac0cd919c27f2e30e4e5ab78772a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

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 http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/79vgm8mfilkm69ovtegvpkal47/13365962635.pdf In PDF document text
    • http://sk-uralstroy.ru/uploads/files/pifabilolusibodujo.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/bexeto.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/pivuvamesatupefekuz.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/vibunorejujurupo.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/66236982062.pdfIn PDF document text
    • https://kratky.eu/files/file/bojomirexu.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/limema.pdfIn PDF document text
    • http://clingac.es/d/files/gafofefutukupi.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/80533514007.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/zafufalosokuranenowowa.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/56601305439.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/saxedavunefov.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/xawodutoninot.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/57843779738.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/30435732413.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/86791493163.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/rujaxumukekesaxi.pdfIn PDF document text
    • https://euchebnici.com/img/file/79884222328.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/25504020707.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wojidurexilazebowad.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/pebuwaletemuraf.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/41511624376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=access+phone+data+with+broken+screenPDF 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_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 18288 bytes
SHA-256: 9097c80ffcb6900f8dd6be70fa2b2fb0fca17f6eadc975e6c990f8492c6b5609
font_01_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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