Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8229586c9fda1f9…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 12:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3fa11db23ee1828cc2d4f9593a527bf SHA-1: ef5d2cf7561881d406b606113f1e4d523a941064 SHA-256: d8229586c9fda1f9d68787ef7d3410cb657beb144eb65f10e62254e6bee32598
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=123d+design+app PDF link annotation
    • http://inbeeldt.nl/userfiles/file/xiwasejikawadumukiza.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/penijorisive.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210907_6A668E32606202AE.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/32281752164.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/koxepizuda.pdfIn PDF document text
    • http://www.520amis.com/upload/files/kegejugidojelivol.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/paked.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/zetusotosakemavitiwib.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/madovekexemav.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_7867D9CEEF9C5F94.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/99974528020.pdfIn PDF document text
    • http://vanhacollection.com/images/files/pojavosezepizetenasak.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/sigobudi.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/2083298435613971e56261e.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b78bb171ecfdfa4c04ff484a7550da9f/91096774304.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/tizuzatexevolexeso.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/47169761943.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/64094462365.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/63833004787.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a84p3uu117jhfrctedue2us4jc/68787452012.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/lamaxapixagotanine.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/21266378930.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/geremani.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/59581958504.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/pevidonuxokivurazuzu.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_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 10448 bytes
SHA-256: bc8cf16db4e5898852cfa1bcd9a87703ab68c679abfc0403010be66feb30e8b8
font_02_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 19352 bytes
SHA-256: 02a009dae77339514c4347c47e65745ea52e2afb58d94686716162a76f8e008c

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