Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24a881b94430515…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 15:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b663b4fc7e92e4793132865c91892d7 SHA-1: 4f2452a4098a4c722c51548a6c5e688a35759b9b SHA-256: c24a881b94430515e2e2541843bc3f6976ca2ea8557c96da2470978acd271920
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. Heuristics indicate the PDF acts as a link farm, presenting multiple distinct hosts and redirecting to other PDFs, likely to obscure the true malicious destination. The presence of a 'Download Button' lure and QR code lure further supports a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nhatrangpalace.net/app/webroot/upload/files/6494961671.pdf In PDF document text
    • http://mobilni-kadernictvi.cz/files/file/bopuwelewenixirod.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/betajigo.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/46430957580.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-18/20210918010806544641.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/23966923699.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/91181399003.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/norumalenalusifinabixo.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906181528.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/18314495999.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/wasidoru.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/24443549025.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/duzesudugigib.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/lesajogejidakasepesare.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/zuxulijeluni.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/saditaxotumobegaz.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/40279262486.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/zosaronulofijozo.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/kiruvi.pdfIn PDF document text
    • http://shahgrp.com/uploads/91894752085.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49e6c6d46---8945223843.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/pezozobiluxi.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/77552474357.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/revebopekitafodarud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=saamy+2+tamil+movie+downloadPDF 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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 17256 bytes
SHA-256: c0bd6fc01e68b2137cb1ec33aca3dac53c93dbe4d15be8aaf07dbb48dd0df9f5
font_01_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C76 10604 bytes
SHA-256: 3cb6aef3bec6fbaf6aeac472c882586110a8e5129c72631015a1c7bc091d9cdf