Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3f7c76d01f4a66…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 18:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 572153380194f4851ddfa1a138e88f5d SHA-1: 1494e73784acc7e59ea5c9c63fea50362d1662b1 SHA-256: 8c3f7c76d01f4a66740c9fae099495d675efd6bc3ca26497b2ce4c18a712f37e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://chcial.ru/uplcv?utm_term=mp4+movies+download PDF link annotation
    • http://likuidart.com/files/ckeditor/files/firarusebupari.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/56967991016.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/newefirubes.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/63876272823.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161368443d979c---tekifurofixidado.pdfIn PDF document text
    • https://eetravel.net/file/86686876653.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/zexezijirojebozi.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/54052808747.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/lelimukaka.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/fajejodebasikudasa.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/pujesiwesopazutimoke.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/80243471131.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/demesijemegez.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/91143076952.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/31520147887.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/rifatigi.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4d5a7f07---41326030967.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/janujo.pdfIn PDF document text
    • http://vaynhe.com/upload/files/63767179991.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/jilibabodifemivu.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905130040_vbiasa.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/rulogigezevodo.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/46988259187.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/99204404279.pdfIn PDF document text
    • 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_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 10580 bytes
SHA-256: b2b30adec5374f446b647f22f4bb111ee085b3cb21164c713ec1dcbeeb0fb619
font_01_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 17184 bytes
SHA-256: 9c588ba0de3f7fcc55fa917a2094c88a6e4f5488b1f7223414bfe8d85e8f6b09
font_02_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.