Malicious PDF — malware analysis report

Static analysis result for SHA-256 691f519f90ab8538…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 17:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7755deba29897f263b48946a9bbddbf8 SHA-1: 92a7421280f0dcfa2f4ccd480547b956ae537173 SHA-256: 691f519f90ab8538ddb8c96b5e0422ac56ad72d808e34810c36deeac4b43df34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs that point to a link farm, suggesting a phishing or SEO poisoning attack. The presence of external URIs and the classification as 'Pdf.Phishing.Trojan' strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=top+play+store+alternative PDF link annotation
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/3121519576.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/64083103493.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/xusirepebabevevamaj.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109070516288408.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/turejozakenevujuk.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/pasuvujilup.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/28651085169.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/2443746356.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/18053787083.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/farogidiparenifo.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/pukifumidusezajaboju.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/zegefofonazafu.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/19811876210.pdfIn PDF document text
    • https://12shio1.com/contents/files/vedunevema.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/nidavozepivikiretogur.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/rovibuge.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/42478063843.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/37715747006.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e5d0911ac---16159358059.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/sisezebuk.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/jofesavufa.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/2298751021.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/37417157953.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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 10388 bytes
SHA-256: 7dd3128bbd8703349a115b195ee7c3e6775e15ebc4e53acda43c6223222acb98
font_02_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 17116 bytes
SHA-256: d62c86c77ff72ee1ce2d15263be4877ac87d0575cd08c71f050feb199da22729

Open this report in the interactive analyzer, or submit your own file for analysis.