Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded797c2b8e63401…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 22:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a71ecbbdea6b2f6ce592c03ac410d48 SHA-1: dc4375428e2018be67d9f9fba6390794f02a96d9 SHA-256: ded797c2b8e63401b631e6007a2cef5b1944cb3ea49c52b616cd88b6992a3828
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a heuristic firing indicates a 'Browser extension / update installation lure'. This suggests the document is designed to trick the user into installing malicious software or granting permissions. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a downloader or initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gianniarnaudo.com/userfiles/files/pidofinorodomokure.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134462948c93---49016288397.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/73703757480.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/6759880326.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/vufipo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/155197756613bef35b7465.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/39384922668.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/vufelusemawexepowu.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/37145669866.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/43186200968.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/jovifabupisot.pdfIn PDF document text
    • http://nova-auto.com/upload/budovedazowivomowusepi.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/13045074317.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/18806553289.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/botigijalugibiforin.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/benatob.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/91384375286.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/59184618302.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/22988857275.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/wotopawopavuna.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902121822183407.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/90197544780.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/pusoxadezawomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hack+android+pokemon+go+2020PDF 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_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 10868 bytes
SHA-256: 961ea1982de3f00735c9986abdbb6e6de2960c865fd1fd4548675ac990907ad7
font_02_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 17952 bytes
SHA-256: 95f656cfe0996f60afd61131629cd68ad13dbeef07358b01f02a189bf8d45c26