Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ac93b4ce8b3893…

MALICIOUS

PDF

60.9 KB Created: 2021-10-03 04:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d8f19cdff9e16135d7f8377bfa7a67fd SHA-1: 0600447a5438f878fd834ac7858a3c6f5e07ef1f SHA-256: 97ac93b4ce8b389322c365809810e8d3f71938d9c667c5181805988b2e5d3c92
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a specific ClamAV detection for a phishing trojan. The 'PDF_IMAGE_LURE' heuristic indicates it's designed as a screenshot to hide clickable links, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests it's part of a network of malicious links. The embedded JavaScript likely facilitates the execution of a malicious payload or redirects the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6527

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 60 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://iscyber.com/userfiles/files/20799493011.pdf In PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/xumozigoreje.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/82458594153.pdfIn PDF document text
    • http://irths.com/upload_files/files/22696998620.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/49590406051.pdfIn PDF document text
    • https://blgjad.com/upload/files/70710759438.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155eefd5295f---lirikusivo.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/51944594278.pdfIn PDF document text
    • http://activesites.atiks.org/files/498706842.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/napug.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/vexurikeluzufonabuxa.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/goresimejamudizitak.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/raroruroku.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/zivibobapeluni.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/rokalotitebuvutaxi.pdfIn PDF document text
    • http://ore-processing.ru/d/files/22182506728.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/83648001916.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/sazuz.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/sejiganizidevavefuduxus.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/35519683659.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da46b465dc---vemilubajifumeralikigo.pdfIn PDF document text
    • http://msiutilities.biz/documents/63314154589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+many+cards+in+an+uno+packPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF58 10780 bytes
SHA-256: 0637662fddf71f92f77956358939508d6c5b4eb8d427909cb195b57601b489a4
font_01_sfnt_off0000c832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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