Malicious PDF — malware analysis report

Static analysis result for SHA-256 604d4394e9bdb069…

MALICIOUS

PDF

74.7 KB Created: 2021-09-22 10:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb46c0ae25f088bb475dd8e78ed9bf03 SHA-1: 7c6afb13cb8b731a3fc610c7a054655d2cc7703f SHA-256: 604d4394e9bdb069def00ff9d42340513946fa0a74173221bed92bfe8a733460
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=john+nes+emulator PDF link annotation
    • http://yildizteknikelektrik.net/resimler/files/16944428762.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/40705a7976d66fae3d06519a479fb3c3/10873810346.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/10041662560.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/14508055768.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/80177486686.pdfIn PDF document text
    • http://khocabien.com/uploads/files/novejibetotovifiz.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/kofosigimumebagip.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/45519971109.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/7430852197.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/16836061871.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/xatil.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/gukakivekirupunufegosinod.pdfIn PDF document text
    • http://domosplast.hu/files/file/18338693205.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148ea67d4cb2---32225328793.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/14192071228.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/bidujumowuroxubevibun.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/16490931179.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210903_1F23F42E95F10858.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/4127442431.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/juwemupi.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/zaxuruvomoxedik.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kudegazipolotig.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_off0000c15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 10372 bytes
SHA-256: 47f03db202fdcbb3f4ef9c87d081d714dba52edffaeb8ce62273333b89d333f9
font_02_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 17284 bytes
SHA-256: 2f35ed0eba555d9be8223e365c72880b7ab6e662d661f1f238c99e1ea85bf906

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