Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d379429b4fc04d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-18 09:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca7ef0d94d0c7136fc4d6650b925b3cd SHA-1: 3c217677a970d11dc51a72e96dca9890133fc468 SHA-256: d4d379429b4fc04dcb9edb8587887e58cede4da40567587b4d1fdbb66e8338fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful external sites. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=apps+similar+to+alfred+camera PDF link annotation
    • https://lesartsdansmonjardin.com/userfiles/file/20210917023306.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/dijojevoxoweni.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/67974943202.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a3b3c2e4---wititijexekolusetiwavejed.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/94018470368.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/12681659515.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/dapepejez.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/35805610226.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/lupunabavuroruba.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/29919974560.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/benume.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/mimibumuboduxesapekutako.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a9e97317f---rugokapedunilogigabuka.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210918044403353.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/59726829395.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/juwafopaxesobisilokexig.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/35828179598.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/12864759102.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/fadezuvesiwonufomukix.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/sasujofomusip.pdfIn PDF document text
    • http://philipsphotographystudio.com/jixozo.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/fometutube.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/megim.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/27520968154.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_off0000b5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 16060 bytes
SHA-256: 04aab54d6cb452147e9a08e70df76858e719d87e45ecd3c7cea4b2c7a442a2e1
font_02_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 10660 bytes
SHA-256: 46e8f83106654f953f1d1a4015676dff27045e4cb50a9a0a2ae7909a21b30309