Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb5669eb2596c35…

MALICIOUS

PDF

71.0 KB Created: 2021-10-01 06:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 813d63eb573f2935687de59197b63d12 SHA-1: 01524e1165900c44ba46a52540e529a74069051f SHA-256: fcb5669eb2596c350b5dbecac09b26af74ed6a72a7628c3f3193b4317b495661
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of embedded JavaScript suggests it may attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://futiandj.ntgis.com/UploadFile/2021/09/24/file/20210924_072433_123.pdf In PDF document text
    • https://titishop.co/upload/files/kawezerunuzup.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/regekifaranelepejigu.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/bavamazamumivoliweg.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/29050592159.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/36522275513.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/43547521325.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/65405926034.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/volupabewomuwu.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/lamigajax.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/wumatuleseletexuxosurili.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/xinoletono.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/1939446819.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/tadujipitek.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/xasasofisopowidep.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/puroj.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/39478444627.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/55445900220.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/bawenuwajenunuj.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615616a5a0af5---39252634688.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b040428aa---20299191320.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/wulevikipezu.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/pokobesifuwalekugixetok.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/46175585412.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/57554057739.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/46090167630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=97+king+of+fighter+apkPDF link annotation
    • 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_off0000b2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CD 16844 bytes
SHA-256: 6f628773607c1f05f37c87149dd25ca523caf7e1590729894ff3c45180738cdb
font_01_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 10636 bytes
SHA-256: 5662b4b11c753e7d3188d277af3e7ceb922a6d1dcc43866bb6a60d71b9aceedb
font_02_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1