Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f53746341c37aa…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 08:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4543df21872aabeb567176665c446b30 SHA-1: 2c433dbd85a0b5e7e192199caa7f90fbe11e1f98 SHA-256: c4f53746341c37aaa535815fd0d253a9777dd345f2f7c1f427fc20d963d10ec0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=tsf+launcher+3d PDF link annotation
    • http://garage-fuji.jp/js/upload/files/zogapofenepuxidoxo.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/modeturixevudokosizek.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901060512_1wna5t.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa4cc733d---ledezawurejofowoleguzapa.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/29416749156.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9496159573.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/70539635424.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/zixomuti.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/88648163212.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lamegek.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/108028479161467fba1e6e4.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/vakupezutolizive.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/deruwitujinireveg.pdfIn PDF document text
    • http://telecycling.org/files/file/vesovebekepovafuw.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f207faa6ee---51406584344.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/wonizetulenifobitunuwira.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/76955412371.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/15721379587.pdfIn PDF document text
    • http://rsentco.com/upload/file/12477901898.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/sanupilasobulowalad.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/wosufavawomurev.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/mizixeradafuginof.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/35460706108.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_off0000c186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC186 10496 bytes
SHA-256: dd113bd8117ef7ca47fb4c1c016fb7801171a652ac02d37d8a36b30cdbf32967
font_01_sfnt_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 16340 bytes
SHA-256: e0a8ad1d760ee8a1a812a07e90b4af2be457a4c042a5753724835ac98ee24f90
font_02_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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