Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab18585ed2a6157…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 19:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35993356666bc088829ac6519ba334bb SHA-1: d5abe17ca8d3886d967ad4c920a6e48f34cda1ff SHA-256: dab18585ed2a6157ed7b0bebf03be9b9ed12e7c95e3e7929f119bd5ac8af6a56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://agataklimowska.pl/userfiles/file/60845461626.pdf In PDF document text
    • https://mumegram.com/userfiles/file/rifuk.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/ranulatarumonol.pdfIn PDF document text
    • http://contelex.it/userfiles/files/1541917558.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/tagobeto.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/37446533482.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lqbii32tn541so30bprkqs258d/livek.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/22925796920.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/35215014322.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e36b720871---gisagaparisisarin.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/17535937915.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/fimogofibilegodeg.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/35820789839.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/rupis.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/85272224987.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazenez.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/65066577060.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/letofurozudafoga.pdfIn PDF document text
    • https://jensbrode.de/files/file/99397722648.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/getok.pdfIn PDF document text
    • http://meskerjager.nl/media/files/didesuzaxuxaxusuxu.pdfIn PDF document text
    • http://regmac.net/userfiles/files/severumikawigij.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/juremoxevojoviteduromud.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/wobuzikekefe.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109201337306780.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/sijevarobafitan.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/1577202012.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/32945637236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=nerve+impingement+armPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 10304 bytes
SHA-256: 117742202f4908e5cf86b8a54c8423fc774f5cd228c7ffd4a7092bf985a1fd1e
font_01_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 16968 bytes
SHA-256: a43fadeb17b8ca24cea5dd7aebe40e9cf7954b35527766af22f478d15244bdd2
font_02_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1