Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb759b32a237c943…

MALICIOUS

PDF

85.7 KB Created: 2021-09-27 19:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e589c0d8b101a0dcfb68d12cf5e7189 SHA-1: b6a73a99c9c15df61d15a5d2ac2607414629f4bf SHA-256: eb759b32a237c94353ec1eae6c2f643dbf92c388c821551908ef8691fdd04deb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

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 http://northmarking.com/userfiles/files/xewafidabazakot.pdf In PDF document text
    • http://www.oomewatersport.nl/upload/files/loxojixibufokuse.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/64464741596.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/puripivapivewis.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/42352021080.pdfIn PDF document text
    • http://simonide.org/userfiles/file/70587561640.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462081efcbb---37058094166.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/32921419062.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/37861923168.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/48654114349.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/retigosogedodi.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dowosiwinisituk.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/tixelodafa.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/24230642965.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/vupokobowepidubeseji.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/71707371683.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dcfbd0f75---timodonabopomosob.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/83743450110.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/70424800693.pdfIn PDF document text
    • http://topp.pl/_topp/file/zabewumuxivubunuzinabi.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/40559758489.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/sotodimizegiduvav.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091107041655.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/93929615276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cara+download+lagu+osu+di+androidPDF 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_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 10412 bytes
SHA-256: 55756766491a921c440e54b9b6ddd6f317c6a4bf4b6c3371eb4561af440390eb
font_01_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 19740 bytes
SHA-256: e02755be56bb0041abd871b0c1f47f7e87b03b578ab91cde775a29eb0f2a6cb0
font_02_sfnt_off000130d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1