Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63cbd86e8e491d5…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 04:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ac50a50436240890dc5a21ee04077d2 SHA-1: 1c19473c0dc776e2ee2a40d7dd466d3be82b2b5c SHA-256: b63cbd86e8e491d5b4fee023ac18ea13ed300ad88460de3ddea8e07d62afe7c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, suggesting the document's primary purpose is to redirect users to potentially malicious sites. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=how+to+get+business+perk+points+sims+4 PDF link annotation
    • http://drcleancenter.com/uploads/files/202109092123015672.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/nijamomulipozaronexani.pdfIn PDF document text
    • http://tobolsk.fluentrussia.ru/img/content/files/60986389620.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/robimotogiwuxutomebe.pdfIn PDF document text
    • http://eva.am/files/f2b09a8331172d37.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/25672374629.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202195148558529.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/texorobadus.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/82466669820.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8f4c19e0ff5eab7d1d55d09f23d6f0b/puronega.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/zezixefip.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/58394847847.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/vusazorenenuvajovogo.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/xulukufeviwejuxeje.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/nuzewupixozavutoxejazat.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210901170514.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/vafefufidexelulelurox.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f8bc96280---13168908019.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/99659288748.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/59454424138.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/vanomimigititot.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/88035298698.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/14112716504.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/faxunabapozebobojuk.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/19311794148.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_off0000b039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB039 15024 bytes
SHA-256: 083f14eb1016fb9a132a9c42b3efeed67cfb3f14dcbbe946cdcb5786e21990dc
font_01_sfnt_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 10876 bytes
SHA-256: 2fcdd00557b369b8a7ccb79691d0fc6b511e8cac0c843c6c8a3b6c77bb17a8b8
font_02_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1