Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6fbc519610c33a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 03:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c0fe8f162dd3ea1ef3d01efe255c3b2 SHA-1: b186ac79f352c43f96c925086499f29365771904 SHA-256: fe6fbc519610c33a66836753488b5b683dd5ac87d940b22f33a5cd720291f54c
126 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. The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a tactic to obscure the true destination or host malicious content. The presence of external URIs, including one that appears to be a lure for 'windows movie maker 1.0 download', points towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nsfeed.com/_UploadFile/Images/file/65059613143.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142e96cacdef---rovafawijawuduzutaxov.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/63384200011.pdfIn PDF document text
    • https://paperland.bg/uploads/file/pitotigemuge.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/fovofikapodokub.pdfIn PDF document text
    • https://menu2uplus.com/images/file/posigavegu.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/futonusunevuvagevo.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/78368642203.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/78757674436.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/462160292.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/sojabul.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/10689856544.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210909195311.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161326964028dc---30524169929.pdfIn PDF document text
    • http://kenhquangcao.vn/uploads/files/wikegatavaw.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/dinedared.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/58578684547.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/40174583649.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/25860297131.pdfIn PDF document text
    • http://arablift.net/userfiles/file/57066283049.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/70117653343.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/tazelevosagulo.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/22704029402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=windows+movie+maker+1.0+downloadPDF 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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 16792 bytes
SHA-256: 6e8738352d05748cb32d27447786e8945318bdfb036c6f7f2b522367d261ef8e
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 10788 bytes
SHA-256: a1e675e8f5e779f293a2d00e744dff663f7101dca2f53550e8776e86c5dcec5d
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1