Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dabe10ab4670bb…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 00:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f939d54fb93ad508fd6ea2d1fc53755 SHA-1: 299fd543c390baa149f8390096d56eacc1fefe7d SHA-256: f6dabe10ab4670bb96fa69fb00415e374302b53a408b7a23f4d30b6b94037c73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, suggesting a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that these links are used for malicious purposes, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/1968892149.pdf
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/12651070009.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c57ad243adc27823f3f466426e772eab/mivaniga.pdf
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nabamaxipaduzalolalepel.pdf
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/vivoxibijamok.pdf
    • http://gzafjc.com/uploadfile/files/rozemix.pdf
    • http://drxzhang.com/userfiles/file/25149230216.pdf
    • https://yifff.se/userfiles/file/xafijozarefepem.pdf
    • http://barexkft.hu/userfiles/file/polupivubezazabiduzox.pdf
    • https://poulinstrapscan.com/userfiles/file/67486439356.pdf
    • http://safarekhoob.ir/basefile/safarekhoobir/files/niwenukim.pdf
    • http://myucmas.com/userfiles/file/13279841285.pdf
    • https://rieker-consulting.eu/files/file/43116866733.pdf
    • https://eingangrad.ch/userfiles/files/gedizonagakemudorizobe.pdf
    • http://corporatiegids.nl/uploads/files/32278523750.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8v52ub7s7bnd8jro3o170olh60/31817333435.pdf
    • http://kqcme.yiaiwang.com.cn/upload/files/62913113546.pdf
    • https://landi-bg.com/images/file/38411932308.pdf
    • http://emblem4home.com/UserFiles/Member/File/30351480522.pdf
    • https://floresdeserrezuela.com/aym_image/files/29721458096.pdf
    • http://sharon-barron.com/userfiles/files/punik.pdf
    • https://avenue102.com/uploads/file/17512599732.pdf
    • http://hcstonetw.com/uploads/files/202109081054042989.pdf
    • http://studiodebiaggi.eu/userfiles/files/zaripewabepamovelateki.pdf
    • http://jncs.kr/page_data/file/20210919065535.pdf
    • http://status-go.net/gfx/userfiles/files/xurowuzabakojik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=app+backup+and+restore+apk+pro
    • 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_off0000b3c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 16792 bytes
font_01_sfnt_off0000cbda.bin
87ae3d3effd3d1e56ab61770c35296263b6ab209145269fb067d7a7d944b38dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 15760 bytes
font_02_sfnt_off0000f3dd.bin
7e852f71e420fb4740be3a8eef7d7b99bfd3b44d48920040ef31284b50ec1390		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 10684 bytes

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