Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6823ed37b9485d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 07:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: affb1318218cb8d3144ecffc417ce7de SHA-1: d9315e1841264c49d367604d3ae8bee0d1668dd8 SHA-256: 6c6823ed37b9485db65f0e2826e356020276dca216268ec4592c218a8f0a4913
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also exhibits characteristics of a link farm, with a large number of external URIs pointing to various domains, suggesting an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://livre-d-art.com/ckfinder/userfiles/files/18835092787.pdf In PDF document text
    • https://mgs-on-track.com/uploads/misc/files/noboweko.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/38009218469.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/jififubagosevogixamurenud.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/ketufuwovafiwige.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/88428144846.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/fozajuwemodukuze.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/desipe.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/xefabobikoxikiji.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/35231465927.pdfIn PDF document text
    • https://carlojans.com/cms/file/divovitonu.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/13243203456.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/fevuxitoxazasofokus.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141897f7131e---35449289594.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/16406102432.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/80881068342.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/79341070803.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/roxanodogunujezipumu.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/67589016910.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/14472506060.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/23262856769.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090502100073499.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/jabokazazosanixos.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/80172863247.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/zidunabijojos.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/pirejezazexewaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dungeon+hunter+apkPDF 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_off0000c8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 10420 bytes
SHA-256: 48462272a6f46992aee8d8b2fb680fd5dd0a85788a306c500b344575d5881223
font_01_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 20792 bytes
SHA-256: a467d3e9c8277a8ea2ebf4a18e74f2076b63aeb96f230e2e29e6e5a619e77b7b