Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cf74675304804e…

MALICIOUS

PDF

59.6 KB Created: 2021-09-27 17:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66b4e0658c316180fdf453f8921d6fd6 SHA-1: 8f30a4844429a9c8f156652e1eced64ec45056f3 SHA-256: e1cf74675304804e97a276cf639cbb11daf0313d0a97af83a1e4774a667469b8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link aggregation. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7240

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://smartech.lv/sites/smartech/uploads/documents/files/35484085157.pdf In PDF document text
    • http://kraski-chernila.ru/resources/file/2314369993.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/19970709363.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/gewevekaxixomumabaja.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5a79da88473e93e79c658a6f7870f4b0/76133014308.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/rezonevelejodofedetaniret.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/bevisat.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/kiwomatekefomewofon.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/mekatomawufomub.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/80062873870.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/xemoterekijof.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210915142707.pdfIn PDF document text
    • https://tessuno.com/upload/files/61421a47c0e5e.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/zotasijosafugagotimewonu.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/15656967584.pdfIn PDF document text
    • https://www.confirmedtour.com/files/jiloxaditadonuxiwoxa.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140ff8d72e99---dibesazef.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/zudunozu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/74607965327.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/66858341698.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/sagafulidexewasapan.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/nubetikasimatifada.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/xexagoginad.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/rebaroxosavomiwisibor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=name+of+website+file+managementPDF 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_off0000b07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07D 10660 bytes
SHA-256: 6f53ad2b5beec112e5ee305bed257b2182c775da87df92b58b76569b0a3c2932
font_01_sfnt_off0000c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 16556 bytes
SHA-256: 03d44f1b385a1c4fd313537af1da626015e7902238062da0130c809cd0d9652d

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