Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6aa98f4e5ed44c5…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 11:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbf9ad925d3dd1d1058953c83d915154 SHA-1: 2695ae7f2ff5372b59309ef73c89dcc4b2f412ae SHA-256: d6aa98f4e5ed44c5ef398deb4310815112d75f73e1624ddd81d6ac2553796b8f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to PDF files hosted on potentially disposable domains, indicates a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/55085252834.pdf In PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/85498633737.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/fojafawaweduwowo.pdfIn PDF document text
    • http://jawarakreasi.com/file/90623692141.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/mikurifajirovorazusojanax.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/turojege.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/tokipukavegeg.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/34845059140.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/giviwidetezegez.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/wovuwuwovotopibitibalomaj.pdfIn PDF document text
    • http://pololanna.com/user_img/files/vejub.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/fufevimubazikagomepusas.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/torugasakopomime.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614aef1ae8be5---kegedoleritidifo.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/rivokidudusokizutataza.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/44298914859.pdfIn PDF document text
    • http://oris-am.com/editor_up/48444567506.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebc8d1acd---63442004650.pdfIn PDF document text
    • http://cl-pub.com/files/files/46972168928.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/pidepuwofikof.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/66063668671.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/dolag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=text+message+tones+for+androidPDF 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_off0000aec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC4 10716 bytes
SHA-256: 2eb88dd832148db631cb89d0964ae2fa7f8e8ed633a9f1f9b0d899d98a518058
font_01_sfnt_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 16084 bytes
SHA-256: c29d6725ae0df6a5815e5f15fc8367011b411a0e6d29e89ec2d8176c54ea295d

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