Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fdb4480e0009fc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 20:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c39a15539a8526fdb0dce024fb594eac SHA-1: 80199a3fa647d6b62e0f92abbab27204df4d9cee SHA-256: 23fdb4480e0009fc11825cbfeda68debf419aff414988e482b23acad16426b0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fongyoskert.hu/userfiles/files/dirunis.pdf In PDF document text
    • https://accu-split.com/userfiles/files/wixivujawatuvexonemumodu.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/12298160535.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/jamizavirogidawa.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/vibowulepikizeleburimewix.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/viwovutonuvurul.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/93004051992.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/xirefiwebiwetolita.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/wezijiduxetili.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/84892736761.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/78368667463.pdfIn PDF document text
    • http://metapolar.hu/tmp/dadiwerumotiliwolojizogir.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136c00408342---82909753194.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/77828645247.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/27193465346.pdfIn PDF document text
    • http://agrion.org/upload/fichier/10998257141.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/guxupunasenotedalum.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/fovuranidoj.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/23197308372.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/jumusovomu.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/95377580649.pdfIn PDF document text
    • http://rooptex.com/uploads/2705731897.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/kigolefimesuvamasewok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pixel+games+apkPDF 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_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 17928 bytes
SHA-256: 062cd5c884709f970df161b30c609abc53f0a5e1826bd05bfaed46de5bd41304
font_01_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 10368 bytes
SHA-256: a39ad52419dc62d513b18d60f688264cc48a9f8090724f51861e1909add81f3f
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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