Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3705595cc0f684d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 09:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8a46ecadcb916641afaf80ae326e5eb SHA-1: fde5661e543f58efabd1c6fc88f5f0004eb881ae SHA-256: d3705595cc0f684d3b3e6146f623ff9e6fd8c2652b05944edc2d1b384a76a230
126 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 high likelihood of malicious intent. The PDF contains numerous external links, with one specifically pointing to a URL that appears to be a lure for downloading software, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=road+rash+download+for+windows+7+32+bit PDF link annotation
    • https://profipreklady.cz/www/ckfinder/userfiles/files/15116341155.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614554133c4a9---98460668311.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/bifedagilavomi.pdfIn PDF document text
    • http://synphabase.ch/upload/file/ferexugusuv.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/gelimamupog.pdfIn PDF document text
    • http://polipack.ru/content/file/giguwixukas.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/15535510076.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/87549491464.pdfIn PDF document text
    • https://2winit.com/Files/files/bakerapuripilibewipuxor.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/zivil.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/49027295325.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/xofarefivuforodelezuze.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/fawopejo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161315f41949b3---73117561233.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/50836364880.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/93370645360.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/gujevugufemizu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/71844414712.pdfIn PDF document text
    • http://meditopthailand.com/file/54273192647.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/32558401605.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/12156258701.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/baparoropativujizibamuzi.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riruwojuboxegawijada.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/78418832799.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/fidukaxoxodegemeg.pdfIn PDF document text
    • 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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 18824 bytes
SHA-256: 8b4c96f47cbb949af323aee72ebaadb9a2ff763fd1b7e86968ce4cef63d0cfa3
font_01_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 10932 bytes
SHA-256: 5597b64fd2f1cdab415b76bad3ad7aef503f07dd718009e309e2d7d3625b43b8
font_02_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1