Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3d0548c7fc7925…

MALICIOUS

PDF

88.4 KB Created: 2021-09-18 17:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39346d14b1b560fde716ebd76f109a80 SHA-1: 91ecc0d71b6c37e804bd46287e41dc0a08e61c76 SHA-256: 5b3d0548c7fc79259b5a1b7a6e1511383c76ddc7fe28456168cb7150d22e0212
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, indicating a link farm designed to redirect users to potentially harmful content. The authoring application 'wkhtmltopdf' suggests the PDF was generated programmatically, likely to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://queure.ru/uplcv?utm_term=watch+it+2+for+free PDF link annotation
    • http://kamkmori.cz/ckfinder/userfiles/files/vajirume.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/zujuxiwegev.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/fopejesugadexilolufe.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/27354891476.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/zizanuxut.pdfIn PDF document text
    • http://keacg.com/upload/files/14071082214.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/nererenuzabimotufuniju.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/finupasuxezebepelutas.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/gesijarejuxipaxipidejilim.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/xusepogif.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/wadiwidesi.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/ravawafizu.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/64385463618.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/60454522336.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/18859014252.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/59921446973.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/gokupujen.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/81332654269.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/68109901112.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vqc3vvvs0u7bq6en7nlstap6g2/79145570162.pdfIn PDF document text
    • http://wdnederland.nl/file/wafiretixanomis.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021916334592968.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135edc7261bd---xotazomuzonowalepuxakas.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/gikotunomakijosefabefed.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/fudapobaluvoxesasedo.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/pemilakaditebokux.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/96801766566.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_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10228 bytes
SHA-256: 29d6dc976cdc3bd62b4e94102a9f28c6f8c85832e6bcc5771e3b1c25cc485bf1
font_01_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 18600 bytes
SHA-256: ab093d3b2bcbdb7d2d21483302df0a59c5d090ff89b8acf63195ead5e116e746
font_02_sfnt_off00013c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1