Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ff475c733a43d5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-09 10:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ae904a85bc7bdb9973c4288612e7601 SHA-1: d17af1c6f2567183b0f1501583c36eff69c575ea SHA-256: 53ff475c733a43d58898e982291aa68331f5be48d08774e139466191248651ad
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The embedded JavaScript is likely used to obfuscate the malicious links or perform additional malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://veterinariomauracotti.it/userfiles/files/paxunofuvetokimoketamawon.pdf In PDF document text
    • http://ariogalospspc.lt/userfiles/file/39413251286.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rvoa7086bjg3curmiepp4utggl/pujesibinap.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/sezikelaka.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/64562908171.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/romudupurijese.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/49573431605.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/febopob.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/1377558544.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/70001689533.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sevejosipatemugadi.pdfIn PDF document text
    • http://jainfarms.com/uploads/fidisajoxilawajifaf.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/sekafovusoxozilelewur.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/9266302371.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/baxelutefujijupok.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/5295236206.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/busonetekiximodagarulu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e254b25fd7040fb431c30c274dd99a35/27763104127.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vitunekofiretujegizezib.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/95217723186.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/91166891709.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/vokuxu.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/rokedakowafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=128k+wallpaper+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_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 16832 bytes
SHA-256: 50acd3ceac220d90c013c49a5968f0230e2897a5c4184651f34cfd91c2f3990d
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 10684 bytes
SHA-256: 0bcf5d533c763248cba255770115e9747ae8638f4774a144286cd80ea65e850e