Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad02a28330c1bea…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 12:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e05adf226da79f93b8da911929738294 SHA-1: a33c401853e83a1e61c9290784c0722d112d050d SHA-256: cad02a28330c1beaa306fe87de4d3b6af1e62b29f579f9691ffa2e4ab299f804
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common technique for distributing phishing lures or malware. The presence of these links suggests the document's primary purpose is to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://aroma-es.site/yamituki-n/uploads/files/mukinotilubedewu.pdf In PDF document text
    • http://ledins.lv/cms/file/jitejupotejasuwepowewen.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/wireviserogufelirudugu.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/fowijofesomerup.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/18592171409.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/juwepigagaw.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/3582846752.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-10/20210910221141661453.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/be49e90c178337f8991bb5ca69b0a080/81211604896.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/gugap.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/4145760288.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/36243564986.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/dorujototapigiri.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/zofejunaxabutufibef.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210906063758.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/23982495990.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/rugugejizutalad.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/xunatusew.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/resotiwogobemuvunokegub.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/65794985669.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/51826567659.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/gelujalobijekaregupa.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/kugerupuxejemuwekaf.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/20694469584.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/jazorubadomuz.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/zakevavujevilejuwivof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=woolf+mrs+dalloway+pdfPDF 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_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 10428 bytes
SHA-256: 91d0b4e0f138b701c53d77ec4eb8bfbd4e809adeff293a00176969e6f56e5e43
font_02_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 18596 bytes
SHA-256: 1a9757b39e50fcfc54431b2f1996522d61646f91f63b5410e41bf44d676cf497