Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6d5bf1066c3832…

MALICIOUS

PDF

90.1 KB Created: 2021-10-05 07:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0bbb95124016d31adecd6b3b6d5e6b77 SHA-1: bb3a5dcd2dd1862ee912e60288418720e0e235b8 SHA-256: ae6d5bf1066c3832db7ce6de051fbba52b965c6699202e48833cb69f780d1536
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for exploitation or redirection, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://motelandratecuci.ro/userfiles/file/sutarakixu.pdf In PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/zomivefujike.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/nunawazonesigejevogi.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/35736585352.pdfIn PDF document text
    • http://koutingchina.com/upload/files/pamavisanetudigemuwusut.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/pavawenaruroxobetizokuro.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/megibebijutogas.pdfIn PDF document text
    • http://e-sheremet.com/img/24181020491.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/76214644916.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/gefufakalejapapuroxixil.pdfIn PDF document text
    • https://ijp2.com/contents/files/62975275175.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/borix.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/32996787145.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/76614213016.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/buloxegenok.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/nogimanuvobezob.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/fazipatezelujiwiti.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/dewozokov.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/42991104177.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/9084908933.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/77933272175.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/54885737478.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b395816263733d29194a6423f4d426c5/razuzin.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce05f8e360---71252508254.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/momerakapopesurasovud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gold+price+trend+in+nepalPDF 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_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 19404 bytes
SHA-256: c575de14c422b67baba069caa6c43dea735764635f68c8c520291e8b3ddb3240
font_01_sfnt_off00012b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B20 10380 bytes
SHA-256: a88a1f20a8223848a817e75e32005535579c61200d776de942ac2ad22ba6afba
font_02_sfnt_off000142af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1