Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ea3c21e5cb9c15…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 21:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10f0c65377560f0dcf29f1f7fef0e3db SHA-1: e0c1b95a89888494d207894cd69134fdafa732e3 SHA-256: 80ea3c21e5cb9c1573e28f0465804b1525f81851ebec7ffda822546a283328e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious sites for phishing 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 https://medvor.ru/uplcv?utm_term=bob+the+robber+1+friv
    • https://hasekei.jp/userfiles/file/8188308953.pdf
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/viteso.pdf
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/zodufoposubavu.pdf
    • http://timavoshipsupply.it/userfiles/file/31271680486.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/12298504823.pdf
    • https://areopag.ru/sites/default/files/uploads/solusaturuligigupa.pdf
    • https://maytinhdalat.vn/images/uploads/files/25816047752.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/laguvaje.pdf
    • http://iaestedresden.de/userfiles/file/1886854003.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/zapaweba.pdf
    • https://danielstrehlau.com/userfiles/file/puxagul.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/rilokofurum.pdf
    • http://travelspace.pl/userfiles/file/wukeme.pdf
    • http://www.globalnautique.nl/upload/files/kuvojezor.pdf
    • http://ppogrimall.com/upload/editor_image/file/seturofifonitukut.pdf
    • http://nadafashionbelt.com/Uploads/file/wawufenivitajujanedaze.pdf
    • http://beamstraffic.ae/amb/userfiles/file/pefupewizive.pdf
    • http://skncn.com/u/files/zumavipikoxuzozeromu.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/bazilonera.pdf
    • http://edilcfcostruzioni.com/userfiles/files/zomidor.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/58027711994.pdf
    • http://moriefrusca.com/userfiles/files/gubokesowefuwufelum.pdf
    • https://elearning-chemistry.ro/userfiles/file/xakiwuzuza.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614064ee0d548---24913194348.pdf
    • http://studioingegneramato.com/userfiles/files/60718599966.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b498.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB498 16792 bytes
font_01_sfnt_off0000ccaa.bin
71bd15f89c7d883c305ad70816585a828b791251b0a4f6a27634239d90f2b1d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 16288 bytes
font_02_sfnt_off0000f653.bin
721c79ca51074732209dd76e5e92d23d928f9c913cb4893b3f5cf704c0981423		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 10140 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.