Malicious PDF — malware analysis report

Static analysis result for SHA-256 685301660b8bd6fc…

MALICIOUS

PDF

68.6 KB Created: 2021-09-15 23:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 56c9860785102ea55f9a53ab74d5ae10 SHA-1: 0642d2b46c103028e7d4a45878227e954d9101a7 SHA-256: 685301660b8bd6fc71e756ef6250e9efb62fbf218b48abd262bb227bce21610a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URLs. The PDF structure and embedded content suggest it is designed to redirect users to potentially harmful websites, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of multiple external links indicates a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pospatrans.cz/UserFiles/File/zudigebo.pdf In PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/66818816489.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/18016810047.pdfIn PDF document text
    • http://csp.hu/editor_up/sebaso.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/40020318349.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/76501184176.pdfIn PDF document text
    • http://kco.su/userfiles/file/majabegefiribabugetumu.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/55930475266.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614099f9d7a35---xiwumaxotepelukizexivik.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/45732914521.pdfIn PDF document text
    • http://surtek.biz/image/files/20150329_023709.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/jobopatoriminodigu.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/73376101028.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/15211029703.pdfIn PDF document text
    • http://th-hl.com///upload/files/96748889732.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/99946365886.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/3312800387.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/69340107276.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/25964933972.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/simigamofegulafurir.pdfIn PDF document text
    • http://jsdarvin.com/files/91648766979.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/zegodovebetivulejegaziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mlbb+private+server+mod+apkPDF 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_off0000ae94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE94 15300 bytes
SHA-256: 3ea68261c8a5a00c822c5d95cd8b0e3f70e53201c042dc80b80251b5a0115d87
font_01_sfnt_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 10740 bytes
SHA-256: 68eee339e8f3b1533aabb0b7b2cb05fc2270f7ac75ec66e9d7a2bd6772baccc4
font_02_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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