Malicious PDF — malware analysis report

Static analysis result for SHA-256 64006743f3e498d5…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 06:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b6131b9d900170cd2def845a301d73d SHA-1: c631f2d53d793bd2e7ff9fdc5a1ada9e0fe37742 SHA-256: 64006743f3e498d54711154f0c3f37221d1ca5ea70c1a9b6c79b52dc984cbe35
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to domains that are likely part of a link farm or phishing operation. While no scripts were explicitly extracted, the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://dymenahealthcare.com/upload/fckeditor/file/49532894823.pdf In PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/dedikatudug.pdfIn PDF document text
    • https://cubic.is/userfiles/file/rodigewurulalemiru.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/12482612338.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147e11a6afde---lukarojiwitifonifaziterit.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/35785798232.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/61637730877.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/naguvadeda.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/29510389143.pdfIn PDF document text
    • http://dasbluemchen.com/suvigalesinekixawa.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/lubivixisowijovapizon.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/26558052815.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109170053517421.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/47325922168.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98196650598.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_072059.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/40174018730.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/paguwezikoko.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ad79a9917f747c4fc4f415565b92e0b9/kuzubotokuro.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/beravarisudoz.pdfIn PDF document text
    • https://forumsevens.com/images/file/dezojenudowulonupik.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/72799967870.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/52977053516.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/talafolola.pdfIn PDF document text
    • https://themalc.org/files/file/kewepujozupimofatomalosew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=24+hex+to+decimalPDF 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_off0000bbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 10464 bytes
SHA-256: df5dcdf24a6fa98876e0ae06527312f2fc5d255ee483cd0be48f8d2d184667da
font_02_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 16088 bytes
SHA-256: 6fb46fccec767ba4bd6b315d41927f5571fc2348a025e0cf8916ff0594a84b46