Malicious PDF — malware analysis report

Static analysis result for SHA-256 566dce63de673836…

MALICIOUS

PDF

73.9 KB Created: 2021-10-03 20:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11f1d358346ed92620ba5024a1d27058 SHA-1: 2d4873313be8724e6f215eb0c6070b6165cd8081 SHA-256: 566dce63de673836a5a3a97244b2f179d19ceaa50ae56d42f3cc6d47722bc0db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning model assigned a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, potentially disposable hosts, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://jessie.vn/images/ckeditor/files/zizimagum.pdf In PDF document text
    • https://eetravel.net/file/57998745621.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/rowedakevejaxup.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/59456757086.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/zesapomekilizixop.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/rewoxoj.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/7434606713.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/rinexokokawosegifirugi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/wuxokovarefaxen.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210915164341122.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/botapabagefozilakagunej.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/1718816806.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/vumanatewago.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/12077818249.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb4d7b93a---82226622268.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/28957372170.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/xunarutaroparatuvo.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/55762835211.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/tizabipixifulotexizuva.pdfIn PDF document text
    • http://iscelenie.info/files/file/62815873755.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/14370162393.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/rivewikakofevobi.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/kewowaza.pdfIn PDF document text
    • https://digicpictures.com/downloads/bimukedisiwabopaboz.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/katuwuresomutuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+death+cure+teresaPDF 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_off0000bc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1F 10168 bytes
SHA-256: cc2079d1a7cc8c3d5306a776356f558bfa38c89b75f1658a8cf7ecd0c7241361
font_01_sfnt_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 18508 bytes
SHA-256: 8e8bd3394038f5963de53fb7d73403830195ef708a5623df9ffa063a2c0348c5
font_02_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1