Malicious PDF — malware analysis report

Static analysis result for SHA-256 581814632c673350…

MALICIOUS

PDF

68.8 KB Created: 2021-10-03 08:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f2d2871b408a6d96eb5d9df6903fa85e SHA-1: 50c359c8172c9ccc3a96a5b6010a5eb29161fc4a SHA-256: 581814632c673350f2699a987f203c1a2ba6fe25ca6a0c9ff13e52b6bf0797f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://drafthe.ru/uplcv?utm_term=digital+strategy+example+pdf PDF link annotation
    • http://hyundaiokla.com/uploads/files/34067049263.pdfIn PDF document text
    • http://rinsacars.com/files/others/rewez.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/25624571111.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/28734308618.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/90332330023.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/semufoz.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-11/20210911095907767064.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210929174322722931nrvpcg.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/bonafakuroxonafen.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/99866699079.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/mivanufure.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/luperap.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/862bf2c0e14dcd0c4904a29c3ef03640/83518902898.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/mopadowokudo.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/wusexaxesiluvezuxuzor.pdfIn PDF document text
    • http://lukinserv.hu/file/xijapefizik.pdfIn PDF document text
    • http://qdjshg.com/files/file/22057883804.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/49118782772.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16134afdcd11d4---94970102872.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/woxivulidifuzitenafi.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/58434034434.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/lexesakifomodezi.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/40781111397.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/bemekugiresozujakidimi.pdfIn PDF document text
    • 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_off0000af3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3A 14952 bytes
SHA-256: 54534b8865781e221ab5469f046a46b9ac4e8df44e89c31fe74df8d94bdb7dcc
font_01_sfnt_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 10832 bytes
SHA-256: 3b7c2174ab680e9db8a50ee2514eaeb92c8ac676276b206f2dc7beca56b5d22d