Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd90d2a7850e96f0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 19:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d863d1c7976a968159a1e48dd82a61a5 SHA-1: b99b76c10087e11053f070bdef9eea3c924fba6a SHA-256: cd90d2a7850e96f09dc69aa47b566df671bed1bedb375be30ba97410559a6869
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious or phishing sites. The PDF structure and the presence of JavaScript suggest it's designed to exploit vulnerabilities or redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=peanuts+comics+pdf PDF link annotation
    • http://3asoft.vn/img/files/47874894683.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/19763538825.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/46617747409.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/92713944551.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210913210256641.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/belelo.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/33056894373.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/29150216222.pdfIn PDF document text
    • https://ms01bet.net/contents/files/48207493158.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/74722728360.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613222f593763---26039262279.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/busetebo.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/xavewometezagebegixikalen.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/46997224324.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421cfe911a---33828840483.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/juriwogonidokekijutale.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/gaguridarajokodufovekumak.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/goponeridu.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/juzabefijemaga.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/91822609477.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/72937061739.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/27457293847.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/luwikajefazakemegejil.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/27192475085.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/54911921490.pdfIn PDF document text
    • https://olterus.com/contents/files/lubukibuwiwizojowedo.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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10736 bytes
SHA-256: 71aedecdf5b49f1a230f4cfcf120e316b71bd39c6988be5357c4b443e235ed46
font_01_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 17640 bytes
SHA-256: 06d3c50014257c45da2e4f401afc60a5da07ac0cb892c0144d99b59af4d2ca0c