Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1d03f9101d6b86…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 07:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dde05fd2da1beddaa6ec3fb59d62aad1 SHA-1: 692293d52a9a848a00409d9ed9cc007861f9babb SHA-256: 2b1d03f9101d6b86f57e83be356d5760413bfec5021815fba881e586927c9e5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to other sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests the purpose is to manipulate search engine results or distribute further malicious content through a network of linked PDFs. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64823223712.pdf
    • http://hamkr.com/userData/board/file/62161329218.pdf
    • https://robert-zauer.cz/userfiles/file/69727339124.pdf
    • http://romangruszecki.com/uploaded/file/98826223795.pdf
    • http://jingmingtai.com/filespath/files/20210909132018.pdf
    • http://aurora-c.jp/files/files/diraxezixinuforugevosisu.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/lapapepikubolusevijate.pdf
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/wepekesoxuziz.pdf
    • http://dobermanncz.eu/files/85638951428.pdf
    • https://marblo.ph/app/webroot/img/files/94803282711.pdf
    • http://paoladebenedetti.eu/userfiles/files/253070702.pdf
    • http://nyitotthaz.hu/userfiles/files/vitakepajumoka.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/tonodebizad.pdf
    • https://autonoleggioassereto.com/file/51124514081.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/58280744217.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nekilumigi.pdf
    • http://tuzvedo.hu/elemek/file/jamoloxejewuwopafulolodid.pdf
    • http://www.galiantsolutions.com/emailimages/file/27848537054.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c5077a8d234da418d3c95c994e872578/59589684698.pdf
    • http://theheavent.com/userfiles/files/53543232663.pdf
    • http://nenorm.com/files/files/jememikuxajil.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/pepetesikiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+v+action+games+android
    • 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_off0000f491.bin
b434ded58feda7ad6bc124ffbae07ecd7cda309fd6e414337b9115b062ad0883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 17048 bytes
font_01_sfnt_off000120b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 16792 bytes
font_02_sfnt_off000138c7.bin
697e57be6a1e19407a540d710ed17dd592a56a2258ce42b66d4e3e759b899e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138C7 10772 bytes

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