Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba5aa2db5000001…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 13:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3141f3a2c1be5562fab0a06139d43bc SHA-1: 71169484bcc1b05913f1a3ce484378998d600be9 SHA-256: 5ba5aa2db5000001690e7e233ce5265d151fb79c3854af24537c240d5ee84622
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious PDF files hosted on various domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://park-seversk.ru/other/js/ckfinder/userfiles/files/jupevubapelexokolusa.pdf
    • https://prawobrzeze.info/userfiles/file/18676034641.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/kozagiwurowuwas.pdf
    • https://goldmenu.com/userfiles/file/wutipetivagividujifijuji.pdf
    • http://nitexprofi.cz/userfiles/file/57170198625.pdf
    • https://windfreeklima.com/upload/ckfinder/files/vodujamuredobuwuwunegu.pdf
    • https://lordoptika.hu/files/files/vonugane.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6bac2c1fb8b292f3065a7249e9cf17bd/pitafuwomekinudatipan.pdf
    • https://techielingo.com/fck_uploads/files/12295447098.pdf
    • http://benthanhsgfarm.net/images/uploads/files/nugenev.pdf
    • http://l-max.ru/userfiles/file/67843742675.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/pogamabixigexuz.pdf
    • https://pokereshop.cz/data/file/kesowefeg.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/ladojig.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/6170547740.pdf
    • http://mingmitrcoffee.com/user_img/files/58008027744.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/90650215406.pdf
    • https://erdenet.mn/userfiles/file/rijudusabadoxatujapalu.pdf
    • http://fatename.com/uploads/files/202109061346392191.pdf
    • https://mldom.xyz/web/img/podborky/files/14719342474.pdf
    • http://messtores.ca/fck_user_files/file/53375526021.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/59210603619.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/vikisoxav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bike+race+gadi
    • 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_off0000af99.bin
c0dceaee579fcdf8c75ebe2eddcf39fcc3313d67d4b96adf2ef119ed86896699		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 16468 bytes
font_01_sfnt_off0000d95b.bin
dd381dc3dd750dae4a48d1d0db068a06ed0850b2f697ca61208381f4da419f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 10152 bytes
font_02_sfnt_off0000eff7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 16792 bytes

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