Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf672e9d9bd31fee…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 10:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8efdb72cdc5c525ca672ca63d0d1c9fd SHA-1: 3f9295803f58bd14d26f1e22401fe1c75fad9e66 SHA-256: bf672e9d9bd31fee817ed31254b9d5e9398166c3b4583280e63a08f182cef5db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://styropapex.pl/userfiles/file/fipevinesipifo.pdf In PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/gemitez.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/78416350699.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630950678.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/5265482343.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/83496314431.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/gududutasimamolutamede.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/23230167579.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136370465839---segazusu.pdfIn PDF document text
    • http://precisao.org/files/files/zejumukolow.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/xokirelizapamekiremalupa.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/jaxejunixazexo.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/ruzajevogowojula.pdfIn PDF document text
    • http://youil.org/userData/board/file/fizewinememo.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/15103742790.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fikageminoxebi.pdfIn PDF document text
    • http://lawngo.net/fckfiles/93399520840.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/70360229921.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/dusowokebiwomibu.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/biwezojalowexisewod.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/xorapori.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/sotofesivawegewevexobo.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/8203969407.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/80233482105.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/jowojomabelesuwivota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cara+membackup+aplikasi+di+androidPDF link annotation
    • 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_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 16764 bytes
SHA-256: 8ee935e744138e8b18a7535ff1fce7b89cef17c6ea0cb499c090a8cdae9836a5
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 10940 bytes
SHA-256: 3ab8a14be57f2ec3bea6f46bfb1fd47b33973ddb975bd297c76ef30c9a490167
font_02_sfnt_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1