Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e40ad285f3650c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 11:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc4206ed68ea99b657dc37417c4ee70d SHA-1: a59cbfc6687c2d2558fc2d367a672ebc56485bfa SHA-256: f6e40ad285f3650c7095caf9d0c68ff212f9c9944946485952462536a9f0dfad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=best+free+race+game+for+android PDF link annotation
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330080b6f7f---pojebowovegerilepu.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/webanudenu.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-22/20210922221615615642.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/pakufavalemekaxuba.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/tubepopewof.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/94343596910.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/69608619981.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/gozazekisemeregatefijob.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/busidedotalup.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/8427826876.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/84549796622.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/86991388154.pdfIn PDF document text
    • http://usateatop.com/_upload/files/najivudesovasajogaji.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/6774577615.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/taxitegizewuj.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b29780fcfa---79362594663.pdfIn PDF document text
    • https://polytex.de/sites/default/files/givawovatup.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/8654102620.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/wezexokojokokilod.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/70147700993.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/xenapaxabopowirebumebimuk.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/43545747020.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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 10828 bytes
SHA-256: 6e17517551d78a37d62a809015ef9dd6fe551ad3e5fc6abc37eee30ce669e173
font_02_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 17952 bytes
SHA-256: d9e090253c12fb1edd5e0f310cb61c5b3737c0a9d69df20ad2682af470d0c526

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