Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e8b26985107ffc…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 18:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34717477c842ae43025f8cea9b1773ec SHA-1: b24e3fdaff1ca743301186051fc35f1c22886f0a SHA-256: c0e8b26985107ffcc13055b8f915567d87bedc5b04f34e6c11c96ed6adc8c42e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to potentially malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights its nature as a link farm on disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the presence of numerous external links and the overall structure strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://irlanc.ru/uplcv?utm_term=dictionary+words+that+start+with+e
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161303bec7d25f---44448437417.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/019c2ef377764006f7ab86ab1b67e9cc/29166483499.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/43965130463.pdf
    • http://bogaarchitetti.it/userfiles/files/sebuvavevunugasenado.pdf
    • https://institutdesante.org/userfiles/file/rogigafemojevokaxin.pdf
    • http://www.toptehnik.si/images/vexezabibaxusupewefaro.pdf
    • https://abriganature.centralcms.cloud/galeria/files/rafag.pdf
    • http://www.huescalamagiaenfotos.com/userfiles/files/fugeguxode.pdf
    • https://mandarinkinesiska.com/userfiles/file/nofatasuk.pdf
    • http://happyorderfood.com/uploads/files/tozefisonipofez.pdf
    • http://www.hgekc.com/media/userfiles/file/wutopelerinafugosevo.pdf
    • http://rafaelstore.ru/upload/files/guwamojuzu.pdf
    • http://bakefruit.com/uploads/files/202109021807449317.pdf
    • https://www.vignolaweb.it/ckfinder/userfiles/files/naxogofapofi.pdf
    • http://www.frank-diagn.hu/userfiles/files/pavivirazawakuti.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f0edcaee---11988694079.pdf
    • https://viboot.com/ckfinder/userfiles/files/857486682.pdf
    • http://e-photo.lv/ckfinder/userfiles/files/kedupuwegikudekeze.pdf
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/xanawapin.pdf
    • https://navoloki.mebel18.com/uploads/files/jejosuvaparedifalaribulol.pdf
    • http://aucoindeshalles.fr/menu/file/70930964100.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e3.bin
7e39452604003fe1dee3e739b976ec6650442a6e6c36d1ea18607932df25a8e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 10624 bytes
font_01_sfnt_off0000ea40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 16792 bytes
font_02_sfnt_off00010252.bin
63fbfd9ea69fc7dfd95c4b24baf3bd722aec00b9f8d3013070081c49ce0dff00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 17700 bytes

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