Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7cd9efc9d2f4e3…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 18:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f2118782ddeb295396721d8bc57b43f SHA-1: b4f060bb9efb939faddc94ffa68dfe5f3a1fabd3 SHA-256: 5e7cd9efc9d2f4e3495900f89900ded2c8e7201fc8f1ca1bf2f269344dac0793
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, indicating an attempt to redirect the user to malicious content or download further payloads. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution scheme. The embedded JavaScript is likely used to facilitate the malicious redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=play+services+latest+version PDF link annotation
    • https://selispin.com/calisma2/files/uploads/boruzafigakuzapika.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/41179797012.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e480a2dbc---butapuvupeguxedajediwezip.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/81413494283.pdfIn PDF document text
    • http://sungder.com/upload/lurufepebomorifotubage.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/99955294368.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614375810cdf2---75155794116.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-5/20210905014440932986.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/livuvebupula.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/timobupetisofidurekozu.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/38616149229.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/86268945562.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/nenireforegin.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/56600878305.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/3666646137.pdfIn PDF document text
    • http://mcutech.net/files/mamejugiwimo.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/vubavoluvovitoboxajubezi.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/zuwurevajin.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/zugegatupil.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/xuledafatopalud.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/67736618414.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/kaxepado.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/wojufuzeteg.pdfIn PDF document text
    • http://synowka.pl/galeria/file/2236097509.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_off0000b7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F2 16688 bytes
SHA-256: 5be01bd42573702701947d50cac6f9dee18da479863358737ec8784960b5d63d
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10404 bytes
SHA-256: 2d9a86cce4b093aa92938afa64aa5ed537e590911134d2fb137963f87721c1b0