Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba73a04af76f461…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 18:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 825b29bdaef0342394f3949a18cf5c52 SHA-1: 7f8634b6159557fa6028bab6ce958fae62e70eee SHA-256: 3ba73a04af76f461d7f7307acf0e786606fd3d8ec2917a2254aec0e0b449bce7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dennismaloney.ca/upload/editor/file/gavalitelaxovabirigirir.pdf In PDF document text
    • http://hide-bo.com/img/tmp/file/darokilobibosesonozudox.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/tefomejusarisafoda.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/83936909920.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/bufofirorolemoraset.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/wepepipakixisa.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/76181604297.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/71c26f263b167b724480e8b2d1ac6bc9/91390940123.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/50257881289.pdfIn PDF document text
    • http://ktcz.eu/files/files/zorelexanu.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/maratazijopalaj.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/rutolerefozasamo.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630985188.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/fafopakatijebonona.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161377d9485c4f---wurazibujexabibot.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/kojugerigizagosujeraz.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/91047983166.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/41123383878.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/musisimefipesukobaj.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/bezowipixujabele.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/46441744744.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908102742.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/61834861293.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/33316697516.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/wigolixuvafibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=adding+subtracting+multiplying+and+dividing+fractions+worksheet+ks2PDF 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_off0000bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 11768 bytes
SHA-256: f44d7aa2c4b85ab3d02262ca61fa142fec9cd0f7ea37517d0b7d265bab7e9a75
font_01_sfnt_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 16912 bytes
SHA-256: 56b351689e12faee8818931598db1608c06b6c85bd815153de5a721a3cfdfacf
font_02_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1