Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cd91dfffedc59f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 16:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: feeca798bb80ee8a34f0650074375b83 SHA-1: c36f9a20b21dbf75919dd6d5d34ae12cffe9fa88 SHA-256: b2cd91dfffedc59f9659b3dbd5ed31eba7311f68e28c3a5b506e9b3cd0fa09b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the true destination. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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
  • 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://oniceh.ru/uplcv?utm_term=combine+pdf+android
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/29058286433.pdf
    • http://jumpinfit.it/userfiles/files/xonixulixusudole.pdf
    • http://www.benyowsky.com/resources/files/posulamapokimeseramapel.pdf
    • http://fertilityupdates.com/userfiles/files/devigagamijal.pdf
    • http://cristal-in.fr/userfiles/file/kaxukurosivopatikeka.pdf
    • https://otoform.com/upload/ckfinder/files/29912777328.pdf
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/walusewoxipexezotagode.pdf
    • https://granitnet.hu/editor_up/xawan.pdf
    • http://chemicalengineers.ie/images/xobanixanuzoduxuluteno.pdf
    • https://adium.ru/userfiles/file/74499741482.pdf
    • http://spzpoz-zdunskawola.pl/upload/file/46537149697.pdf
    • http://mientrungland.net/uploads/image/files/9296291107.pdf
    • http://cz-synergy.cz/data/file/nozinisezizi.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161365e1965791---favuroranebasifa.pdf
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/47707634442.pdf
    • https://lostfoundglobal.com/userfiles/file/joluxowela.pdf
    • http://epicridesnepal.com/files/58601226093.pdf
    • http://phongthuydotho.vn/upload/files/nejinoxijebu.pdf
    • http://theclubburger.com/uploads/files/wugakomaketuwagema.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d17004c4e2f025af4af42c0d99531be2/83732725108.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/fukufo.pdf
    • https://healthmatters.me/userfiles/file/dalefulotomipufexufetenol.pdf
    • http://szjwwj.com/userfiles/file///tefolowizetifuf.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/3342351955.pdf
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/25300918099.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/67335692042.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_off0000d0f6.bin
568a2798c1a8e6d8b57ed1476e3eb651713b5db7344d4e1ce12edf7fe943300d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 10520 bytes
font_01_sfnt_off0000e89c.bin
1d0570fdc7fd3f0e6d24178bd9caf43ad7c2d34e4dae1eac3003311b7a98c6c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 17156 bytes
font_02_sfnt_off0001155f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 16792 bytes

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