Malicious PDF — malware analysis report

Static analysis result for SHA-256 4172c22436542cdc…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 01:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3117c3e8b9a2d464a0c625f2b9ac2e0e SHA-1: 8a026936bb272114163f08fa9efccdba94fd4e19 SHA-256: 4172c22436542cdccb0c054484e1b440045897710708bffc7cdbc04de0abc61f
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one pointing to 'nomylo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=android+browser+for+iphone PDF link annotation
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b94313b8---zogigejevofu.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/miwunufexizadetevexu.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/lotumekatibebugewi.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/jenodoposi.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/mipoteleb.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/kivasapexefaziboxajujevi.pdfIn PDF document text
    • http://mcutech.net/files/61264821209.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/25064609291.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/82583442426.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/42400882329.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/68837720324.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/numeseguzusiwijakunem.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/dawisunaxususurusujifep.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/34172056187.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/folemojuzexudelavimef.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/roxisazuvipovemeper.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/fofivif.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/36255413187.pdfIn PDF document text
    • http://sireny.net/share/files/12888434224.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/visebozeguxarozoxis.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/woxesofazimajovuxumu.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/68540142380.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDD 10496 bytes
SHA-256: 7eb230d7119a8ab96d93411211bd20b63595edb2d00b344a3743f6fb2def2ec3
font_01_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16992 bytes
SHA-256: e319864f12d9fcebce493a300fb2b14a8293d8b0384dec86e59f4e8e706dad9c

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