Malicious PDF — malware analysis report

Static analysis result for SHA-256 515af58e8ad934ea…

MALICIOUS

PDF

69.0 KB Created: 2021-09-14 04:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 031d71c7a33609b03d593a2bb143b97b SHA-1: 19424e031c6b016b7ecf0d3d48158280c3660ddb SHA-256: 515af58e8ad934ea330ed0da6d1ce7e92596312cc6054d3c9e05a322109c387c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings and numerous extracted URLs suggest this script is designed to redirect the user to external sites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autostyle-japan.com/js/upload/files/zigozezovagoxam.pdf In PDF document text
    • https://homestayhoian.vn/uploads/image/files/kekekanonanoguda.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/264828979ee1276ede51aecdc86a45fb/vopirete.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/37099437299.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/93316357040.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109131813287304.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/1151685070.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16136e223b7592---28953752964.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/67444556529.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/lifufipiropuzolebebine.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/vubugorokavadodukeweliz.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/bovizebewapesufo.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/puxaxasidesukos.pdfIn PDF document text
    • http://upakuika.com/img/file/pupijaj.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/85971768019.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/41646580230.pdfIn PDF document text
    • http://baove24h.info/upload/files/gexelevurakujurewoda.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210909_10469A515AF80D74.pdfIn PDF document text
    • http://chamdure.com/DATA/files/fofujanunofetoxubal.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kavojusulufujat.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/liruzodokimipasutak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=super+hot+game+download+androidPDF 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_off0000af69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF69 15112 bytes
SHA-256: 57e7988a1e1100bfde83ee112e4feb5936d1e4b39d7fe142ad1e7bec4a15a4b3
font_01_sfnt_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 10932 bytes
SHA-256: a3f16bf46718147efb9e2fb8cff03a956f69e70184009d9a3b0158f12ea6330d

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