Malicious PDF — malware analysis report

Static analysis result for SHA-256 0211ff6295a4a25d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 10:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: caf71323e0bafd3cdbe4b4df3747ba77 SHA-1: b3273b37163462c4586f87d845ad28e30c825fae SHA-256: 0211ff6295a4a25d693e7150fda84df2729429d67960c0fd805dfcafa7cfb83e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests it is used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/wanenasawexuxe.pdf In PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/vutuwud.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/42463757754.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/27946448292.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/d748303a0b8ad6bdc15cd55340c85ba2/kaxeva.pdfIn PDF document text
    • https://digireg.org/upload/tivimelalurowim.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/88346657421.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/20759683975.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/vigujupogemavekeguvenaw.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pojotono.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/74787992373.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/kazago.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/voluzu.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/xunejowejitesedomi.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/86263811585.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/13510551759.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/pezajagofi.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210905095136488201.pdfIn PDF document text
    • http://ccshecea.org/upload/files/wazapixidinig.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/55817310174.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/lifunokuwalozugagafa.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cb368461---mujasozogidiwotoxosuju.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/fumiguzotokemupapofepe.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/beroze.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/zoronajekuselosiriwibij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=klms+agent+android+appPDF 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_off0000b668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB668 15124 bytes
SHA-256: 393582f4b891ab33b6f99075c7563d31c26e657c1196c37f8d1aead0fba78ff5
font_01_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 10728 bytes
SHA-256: b723f480b15b1fec548eb8f17506cb9f6f0104ff0b5ac9eca448d0b05ba848f3