Malicious PDF — malware analysis report

Static analysis result for SHA-256 333aa8c6da1b720a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 02:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 409807774ae00f218d27b5219ac7ebbb SHA-1: 4284a96479f6a952702d68deb58f683563fc9c47 SHA-256: 333aa8c6da1b720a47b7fd6d943b914593b92166d34ca8a6796e44c48c5689b7
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 websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://hycxchina.com/filespath/files/20210912185850.pdf In PDF document text
    • http://sziszolg.hu/editor_up/pukufipelako.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/zafize.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/fizaru.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/60704440798.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/51036815418.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf985ba3c---61285456419.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/pabolanawidugizi.pdfIn PDF document text
    • http://yibetter.com/data/files/fepitilelomalu.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/gutug.pdfIn PDF document text
    • http://www.520amis.com/upload/files/wusijenovumofu.pdfIn PDF document text
    • http://meta-min.com/files/57701399149.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/zezuwopumozomezunopezo.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/88645716214.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/98885420828.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/milubogowo.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/68451794203.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/vimamebudesunudaxopuvubog.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/35997713885.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/pabexuvafuzugofogekurol.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/27180769265.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/zututizen.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2ace330b4e1cb2438000bb9338d5e31e/pawezawuzuwo.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/61826876199.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nilemufizosuwimum.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/15535510076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=aplikasi+belajar+piano+freePDF 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_off0000dffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 10596 bytes
SHA-256: 0931af2b1fdbca346499a7ea7f636e908dffafb05d1ddf127f20a1775f8ffcda
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 18456 bytes
SHA-256: 0bb2fae2cc8d7d42911883795c903443ee02fe68236580fd543e7b864f43c03b