Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3821cf3f171bab…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 08:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a20b0880bd7b9d0106a64fdc19f4f72 SHA-1: 4383ac0cee01e16569837a6b4926b97222c60137 SHA-256: ca3821cf3f171bab9d62c841f24a45b46163e4a7d226a07eae90a562f88ae47f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests the document is part of a link farm, likely to manipulate search engine results or distribute further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=reface+app+pro+mod+apk PDF link annotation
    • http://studiobardinisrl.com/userfiles/files/todoj.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/55424537963.pdfIn PDF document text
    • http://puisan.ru/uploads/file/vafofudulaxuwezopetojujo.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/lenafadefokuxusata.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/kokagofex.pdfIn PDF document text
    • http://suurelepa.ee/data/file/85731487274.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/48847385249.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/35070087318.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/26573711176.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/jubababirixitopafesewin.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/68961800646.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/xaxawetugukabuxufoxomuma.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/zudezenalofirazarilojixi.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/51967664692.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/segitefodazegel.pdfIn PDF document text
    • https://wsbtitan.com/images/file/31598855520.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q69ht41q34cdpbfgq5qfcchei5/12455358101.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/54329513086.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/vogopotuvimegomosovu.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109252011222665.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/97035926842.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/jigirovukadifak.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d795deae9c73a5b6e22467c34bc6a749/98662189702.pdfIn PDF document text
    • http://ifap.it/images/file/14230637876.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000b0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BD 10408 bytes
SHA-256: ab9dfeafaec22149d61a199f5a6d75b4619fe642db44dce92430da06cccdc272
font_01_sfnt_off0000c856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 16280 bytes
SHA-256: afd70f93867a3b7d8b08849a710778e041da0c204b20d570739307dd4a0c9247
font_02_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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