Malicious PDF — malware analysis report

Static analysis result for SHA-256 24765c34677260d9…

MALICIOUS

PDF

69.8 KB Created: 2021-09-13 16:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a16fd5f2d55a86db3b369723daf294f SHA-1: 0c996c1e77cc1534c36de7b33df5facd9aa2fefd SHA-256: 24765c34677260d93cf08ddc163a8a674a1bd18f6b2f1b3d77071a5f50eb2a62
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=2021+gta+5+money+glitch PDF link annotation
    • http://autostyle-japan.com/js/upload/files/96832205052.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/watokagumuvesagodef.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/kirakodes.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/lukexuwirub.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/56703799327.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/pelida.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/wimutufavikuxufar.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/4629478755.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/nikobepegijob.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/5358147759.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/36738477473.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109052349264968.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/77593069506.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1b0c6d05be2e818a0afa18972962cf88/74382520935.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/vofog.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/53170645452.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/39921180810.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/3502973900.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/36532664790.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/gemewojajo.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/19905025923.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/33699174230.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/23480101762.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/wajobuwadowobop.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_off0000b26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26C 10856 bytes
SHA-256: 2a18909193f8a0e7d3b5bf638282979ab1c08ac413db4ae865e7a04ee65759f9
font_01_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 15096 bytes
SHA-256: 779e98e339ff2b2208e45d9d4210da86043949534ca3d7c3d52024457c113230
font_02_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1