Malicious PDF — malware analysis report

Static analysis result for SHA-256 6527963e12e6b9ad…

MALICIOUS

PDF

62.4 KB Created: 2021-09-24 15:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 420688a39120bb9820ec9fcb9851112a SHA-1: 8b072c1940e870aa44e78599c5a7e3f926e2291a SHA-256: 6527963e12e6b9ad78be70495707e2b94585e85e60da2dafa509b65088ee88f4
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the ML classifier and ClamAV detection confirm its malicious nature. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

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://aviatechinform.ru/sadm_files/78186556376.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095db9f88d---42088440015.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tufubed.pdfIn PDF document text
    • http://sciattella.net/images/file/zegidetikasojakezizegukuj.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/66013226267.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/65641318589.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/lefodewiga.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/tuxogiseboxaketevaforo.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/34807572147.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/dawobafesufu.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/26570863579.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/kizilida.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/pufuwuritujixezokela.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///86656245697.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/81228442037.pdfIn PDF document text
    • http://szjg.hu/images/file/mogedama.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/tumubobokorupikuwadovepi.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/wevuforo.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/lokajapu.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/fodamisobiwoditeloxuwi.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/94552903080.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-15/20210915171415693353.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/zenefuzegalawazamanitegol.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/56624489680.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/89477007937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=convert+pdf+to+excel+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F9 15948 bytes
SHA-256: 216f06cdaa19754b81793d672ebb97ea57c9db4a9fa212734242fa2392307ffa
font_01_sfnt_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 10388 bytes
SHA-256: 3cc56288a8c73cdabd06f291139ccc108eb88a6c2afdf2a45c1af5c4dd659549

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