Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fe95b2e6af9c0d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 09:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b837711d8f385cf6b53b5923b8177b94 SHA-1: ede130853c6d5b7502726a74dda7fc7a975f3a5d SHA-256: d1fe95b2e6af9c0d21dbb356fae8cfb6ce80c000e79fce01cbbde0de9e6e8c53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host multiple links on disposable domains, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://energo-winstal.pl/userfiles/file/lowepizajizu.pdf
    • http://z-sinpro.com/upload/files/xixidorul.pdf
    • https://eledigitalpr.it/allegati/file/venurorotaxudol.pdf
    • http://debnine.net/UserFiles/File/zipigumarafogi.pdf
    • http://tercovci.cz/files/file/44535204750.pdf
    • http://naturenhuman.com/app/webroot/userfiles/file/zorufevepobibilojosakaxer.pdf
    • http://stefanourso.com/public/userfiles/file/94537968705.pdf
    • https://newcar-rental.com/uploads/files/202109122253299158.pdf
    • http://shopabrang.com/images/files/24416871121.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/3594681597.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161324c6674d5c---dadigukuzovuxabojevozo.pdf
    • http://tecksco.com/upload/files/33429080780.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/77982444055.pdf
    • https://kitchensofdiablo.com/upload/file/5289053692.pdf
    • http://media-production.net/admin/ckfinder/userfiles/files/46460781306.pdf
    • https://yp05.com/_UploadFile/Images/file/natales.pdf
    • https://hazeloyun.com/calisma2/files/uploads/baguwezikuradiwekel.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210912_117EE86DA948105A.pdf
    • http://dolonchem.com/upload/files/winamunu.pdf
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/tibofugebesanedar.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/17545901872.pdf
    • https://telorgabus.com/contents/files/menitivapos.pdf
    • http://metabolitplus.ru/files/file/68683496098.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=national+ict+competency+standards+for+teachers
    • 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_off0000c8cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 16792 bytes
font_01_sfnt_off0000e0e3.bin
06c9b7e0ea9889e670a8f4ec6c3a093927cce5b9d082f168b536baa6666bf350		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 10976 bytes
font_02_sfnt_off0000fa30.bin
0ecacb7acc5085fa25418ecad48df84ad989b866fc77c9aa850522af260a98c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 17740 bytes

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