Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b73f6888d575730…

MALICIOUS

PDF

94.9 KB Created: 2021-10-10 00:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7e785973849e734674217732ca3588c7 SHA-1: f1d12539103afa2e705fabd5b714aa888551d5fb SHA-256: 4b73f6888d57573064b221081e36e70bea2c95cf01f633acef6556eb6f760368
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to disposable hosting and are likely part of a link farm designed to obscure the ultimate destination. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 4

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=part+of+the+culture PDF link annotation
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/jafakuvuzapis.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/ralotilemuzikinazumapivis.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152973057079---wigojajoperew.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tegevesipimijugetafegaji.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1736725519613cad58e6576.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/86093368086.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/jomaju.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/91930252796.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/gexodig.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/baxijixupizusep.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/31142514964.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210917075418-fosububi.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/78174692776.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/buraturapolip.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/kinesasusezasubosanuxegi.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/2639507859.pdfIn PDF document text
    • https://insp.biz/img/file/paxoxotizuvuvufojowasivek.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/50646650487.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/lajowet.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/noxeworusijuwenov.pdfIn PDF document text
    • https://baongochoa.com/upload/file/ratuxifavotejaxite.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f19e943ff8bf733b01c15b37cda0baa3/kerutamalikurijita.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_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 20484 bytes
SHA-256: bd36d24f37e0f7a7ffe80cb69ffca52c0ea0b3afd4177111fa754877419879d9
font_02_sfnt_off00015780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15780 10168 bytes
SHA-256: 9c3d982768cd395896276bd7bdc2a4a537fef28d91da914c9cbe4a0b8bcff382

Open this report in the interactive analyzer, or submit your own file for analysis.