Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e43a3581da080c0…

MALICIOUS

PDF

65.1 KB Created: 2021-10-10 02:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 433ec7058ee0f9a5dbafb8edb1b66b2a SHA-1: f14f39f9008313392cfcac7c2f2154896d7e317a SHA-256: 0e43a3581da080c0eb2d32fe653a72d089972db5a66599b207fdead7b738a1a0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

Heuristics 4

  • 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
  • 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://taxicityplus.ru/userfiles/file/65325291861.pdf In PDF document text
    • http://hockjoohin.com/admin/uploads/file/texasunomimow.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/20657048133.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/jotepozijajudawabunorivo.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/40142508254.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/30261779901.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615d7b9c925af---92221721999.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a96da31c240243bc00749862fda1059e/5457566445.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/potirovaza.pdfIn PDF document text
    • http://daiichitelecom.com/uploads/news_file/magedowotexofejin.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/roxilab.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/93442048356.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/72212300939.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613f5bfe3cf1d.pdfIn PDF document text
    • http://markalikonut.com/UserFiles/file/wuwevepawuvojanovidosuv.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/36286286249.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/40311165775.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/rugibotive.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/33761403220.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/witexazilalarevazozol.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/1805797296.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/79719264543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=l4+and+l5+painPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/88378596005.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 16908 bytes
SHA-256: 40fa7fc1fb3eb793c2d564772b5ce8f24689cc2c162b10a4b128ac5971345b78

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