Malicious PDF — malware analysis report

Static analysis result for SHA-256 1935d20a21f54a03…

MALICIOUS

PDF

96.0 KB Created: 2021-09-17 09:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe44e5bd66c1f13cbdf67c047e864eb6 SHA-1: 7019a5926ae64736ec500026a52a1ddf73e5192f SHA-256: 1935d20a21f54a03489864c9690c0676455ba9ca4a397aa6350f7b1a0b5c8ba8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm or distribution mechanism for malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cristalensi.com/public/File/nowevigosune.pdf In PDF document text
    • https://syntellect.ru/Repository/file/zosekukelurukuneb.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/nifililaxekemi.pdfIn PDF document text
    • http://salkim.com/userfiles/file/fagozov.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/ribarus.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/94430856737.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/90169292381.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/tiduvoxazoti.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/sejavisolesamo.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/wamafu.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/pigokixufi.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/sorilipedekijavemed.pdfIn PDF document text
    • http://ledins.lv/cms/file/demixexizujekug.pdfIn PDF document text
    • http://dsfly.com/uploads/files/gupirozudujinirufasejitu.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/firato.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/nasofusedaxajano.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021992219394136.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/12707219956.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/kikagi.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/1841275389.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/wigekobitomimilimuwa.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613632ac6f7fc---lipuzilajimuv.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/40592113909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chess+textbook+pdfPDF 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_off00011361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11361 17984 bytes
SHA-256: ae518f6d424fa68ee5dcba590f99cd433073a357742edf0fd5c5604a3db6b9bd
font_01_sfnt_off0001424a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A61 10456 bytes
SHA-256: e5aa1628843e52d74777c650db3c53581e23151194bb75f4c6bcceccf8c5192c

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