Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebff5e40b59b4007…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 15:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8d9af67ca7d0fbf1df1ae2c8b70aacb SHA-1: 8b307e36107f512c1520db97194706e741868c6c SHA-256: ebff5e40b59b4007f56155e55e5bb907c5df85bab20b165940cb7e90918309d0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4046

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dintek.eu/uploads/file/12838988348.pdf In PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/tibaguzeni.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/rubetomedusejarafopig.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/42146636028.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/8832978377.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/roninudinimikijura.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ce98e2babdc848551c0936da5765497e/kuweleta.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/84144910391.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/38430984100.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/60973710948.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/18279631423.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/beragavokipixerigitak.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/rezaxajesoxeruvunoxikumuf.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/gotoke.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/redifegidiw.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/juziluxukazofixi.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/gurovexutufulugemekis.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/gobixijuzotesewo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3aa06d069---xagigiwaxetimi.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/mupajibopekurejegaf.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/26227653340.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/99915091455.pdfIn PDF document text
    • http://archbot.pl/files/file/gefuruzojesudawut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hukum+hak+asasi+manusia+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 17028 bytes
SHA-256: 44e8ae2d015f408ea013d57f308ad34cab7d72cca63aaaa64d207e92458b19cb
font_01_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 10452 bytes
SHA-256: d0245a4a59a0b4a77afab395deed939107da6082f4e7072949486445a13308da
font_02_sfnt_off000132a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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