Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8170a774f3adaef…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 22:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a952d60bb1284723cb55d961690a8865 SHA-1: d86ff069565ec2c298dde06a4a3f5356226b4141 SHA-256: e8170a774f3adaef3ea8d210f88e430b022f12f711e94673d17733a6870f1410
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The presence of embedded URLs and the overall structure suggest it's designed to redirect users to harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

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://infrive.ru/uplcv?utm_term=war+storm+read+online PDF link annotation
    • https://hargagila.com/uploads/image/files/pudemivadod.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/35567176445.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/remusinobaka.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/kukeretisumazizevofa.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/laratulenimixo.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/84217200165.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/86726144607.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/girufob.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/93454782937.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/93847355307.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/89110332482.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5a6518893b31ed133c5e2f3a37982dcb/99538709278.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/sepubumamegopafoxa.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/28920526936.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/7331351746.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/29225600046.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/duvax.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/39317378208.pdfIn PDF document text
    • http://bndweb.nl/upload/files/mojetet.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210910024537.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/53105400464.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/74280502380.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///59554958635.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/nizuris.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/gapikidep.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210920_052410.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_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 17920 bytes
SHA-256: 8dcc8430e5e0af8a8d425b03b5dbd0e5a322e0b07ae9ae49106e12599d72a456
font_01_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1