Malicious PDF — malware analysis report

Static analysis result for SHA-256 edeaa25d8e6345bc…

MALICIOUS

PDF

68.1 KB Created: 2021-09-11 18:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82ea329dee9aa14209628e0563b8e7d5 SHA-1: 9e60f4e4df20a3ea1feb3f055d3bbaf226616b74 SHA-256: edeaa25d8e6345bca7266d5c522ccfc1ba8e1bf5277a2b124878f29d58d4f77e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains, and one heuristic specifically identified it as a link farm on disposable hosting. The presence of these links suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yourdentist.ro/app/webroot/files/userfiles/files/ripobijoka.pdf In PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/sufipofogukinupewefux.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/50230601809.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/2086416672.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/fugowijuva.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/82709034287.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/3287649335.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/26617150577.pdfIn PDF document text
    • https://12shio1.com/contents/files/mejifajivamolopesi.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/xekuvamevakixudejarimav.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/kufizovej.pdfIn PDF document text
    • http://pasted-radio.de/web/files/69446664479.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/45126836984.pdfIn PDF document text
    • http://iucecb.com/files/file/maguvuwajefo.pdfIn PDF document text
    • http://canadanur.com/resimler/files/tajoxapopi.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/76339221531.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/92369826367.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9a7d4f8ac561c94b450b0225846e4c3c/20776700359.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/2770635680.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/koziva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cat+clicker+mlgPDF 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_off0000abef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC406 10304 bytes
SHA-256: b8402f40d1c18fc8cbe6030b603d806efbd09c727f7806341a64311691722392
font_02_sfnt_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 16236 bytes
SHA-256: c1ddaca63f7452ca2254302aeaf74f717061264ab00900bb0f306a31eb865355