Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be88236f2e08065…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 00:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dac962afe4c49d323ce63d275e23dcc6 SHA-1: 047107654a678d6b6171d5eb1585e8b2f965b3f3 SHA-256: 2be88236f2e08065f86747c897d9c6b59b3edb85ac583e67eee9850943bc3257
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 hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=inventor+of+the+atmospheric+steam+engine PDF link annotation
    • https://gites-les-bardots.com/userfiles/file/52108987726.pdfIn PDF document text
    • http://kes.org/upload/editor/files/53570893600.pdfIn PDF document text
    • http://albachiara.info/userfiles/files/14138223653.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/kotif.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/27165767468.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/91137698116.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/8130946664.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/38757615625.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kabowixilijuxelux.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wuxol.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/84809198290.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/12683844630.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134146a0f2f2---35950776978.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/48875449891.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/sakexevanadone.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/37577518212.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/purofarut.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/xemipala.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zuxugop.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/xofoduvatin.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/40843776475.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/3304205691.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/17275602853.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_off0000b042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB042 16060 bytes
SHA-256: 4ee227bef9fd2ecff0750cf025874470bb4cc4a292b6d8dcdee86a2c2c71a989
font_01_sfnt_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 10900 bytes
SHA-256: ae25aa21a59bbae3fbc840bf75dc21e4da4a0290df10daa5a9f7a0003728b1af
font_02_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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