Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2735ae512fbfdd0…

MALICIOUS

PDF

74.4 KB Created: 2021-09-23 01:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6cc9ef76e50076caacf0a1495c32bbe2 SHA-1: 610ee1b07045988fc429d6d5ad40b597b6054fa7 SHA-256: c2735ae512fbfdd0a591e6f69a1344eaf3e51704bd6c2bcef4379c5fcbeb6923
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to suspicious domains, indicating an attempt to redirect the user to malicious websites. The PDF's structure and the presence of JavaScript suggest it is designed to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=designer+city+hacked+version PDF link annotation
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/32408403919.pdfIn PDF document text
    • http://rc-modeller.se/images/file///wetozefemigafako.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/79822708927.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a8cb74e3---sotujobozinunivugebevuw.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/femakesenodipapobev.pdfIn PDF document text
    • http://congluc.com/upload/files/36226178051.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/30420166924.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/88041283649.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/xogixaduriso.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/guborafuro.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/meviz.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/88309886430.pdfIn PDF document text
    • https://pmms-online.com/assets/file/14826040631.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/kojidetamudizaxawabagoxa.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k12j290bu35tu95bob4rf12pfh/60080436795.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161492cbe74506---pebuw.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/53019678885.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/30691113134.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/dasazomi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29983bd2b---fajidowimilisutixi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/talurezarilunep.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/30453393442.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/26934661067.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_off0000c00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00D 10876 bytes
SHA-256: 57971a23502e36bbd1d56c61e587763c3f54c3e75efde9a35aa3d4b0cc579bd6
font_01_sfnt_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 16536 bytes
SHA-256: e186d60aa3100f7719e3755494bdce0258d7420a908611f7906689b1968eb593

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