Malicious PDF — malware analysis report

Static analysis result for SHA-256 240c341fab4924a9…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 21:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f0d339a17a3b6489ea79b0ec5e9e5c32 SHA-1: d79b6ed8526a34941689bfb5dc89e950d2d6987c SHA-256: 240c341fab4924a9a46c357d36d999703596857cdf2e81239c0ebda4d48c92fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is often used to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying numerous links to potentially disposable domains. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature, suggesting the embedded JavaScript likely facilitates phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/31371127261.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161468972acfce---17563401349.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/zefakasixilupa.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/1cs9vev8f1au4bss9dvfd7d186/xefekanobip.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/mopij.pdfIn PDF document text
    • http://legend-chang.com/UserFiles/files/wutiwibapavekerixewerijer.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/73357713818.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/71265407478.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/87881122910.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/zovijivafijejogiduxibu.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/nawuratomatos.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/gepodisupaxowox.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/vufipejusat.pdfIn PDF document text
    • https://lazerom.pro/media/file/getasa.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/17008390399.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/ritufamatuwidelawidil.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109152029182071.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/nesatazejavasejevadeg.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/rawanirav.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/81110682967.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/butubifulepewimoveza.pdfIn PDF document text
    • https://tl-systems.hu/files/files/dosixoj.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/rilapilediripexefab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=super+stylist+mod+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_off0000aeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEED 10828 bytes
SHA-256: 02a05cbaf4cb6ced6fa69dd6d5d0d5c7e0bebd70b2af809a0b320380117de1b5
font_01_sfnt_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 14868 bytes
SHA-256: 8daa2215be6e6b22ae0b3f9c7a8f8c69dd88a90a2b2c3f56a0fc41ab4ef4866d
font_02_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1