Malicious PDF — malware analysis report

Static analysis result for SHA-256 31daf29c18342f68…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 15:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88e0f16a20210036a9d3ab91b7bafed0 SHA-1: 91f237207c269afe87609bf3bde4e835adfd14c7 SHA-256: 31daf29c18342f682d683ba73cb6d8ff25960e5c2a843ca3fb5178b409717a98
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. The PDF contains a large number of embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://medvor.ru/uplcv?utm_term=poco+x3+nfc+configuration PDF link annotation
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/64732741763.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/sebusafiripiwokas.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/sonoripudusetosuzezokiti.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/datuvodewa.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/86185640418.pdfIn PDF document text
    • http://njxinbell.com/upload/files/vaserugikomebe.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/sesupuzetekoneposerodofum.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/ripobajudibak.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/wufezabodelitamenakenuke.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/nedapum.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/betofo.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/21955182038.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/dofotevoxegatorok.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/64416034114.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/73357839134.pdfIn PDF document text
    • https://mauspro.net/upload/files/lowenenizefijavurapifowej.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/kideduzorawevezewotew.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b81dcbb6b7---79926009782.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/rasukefadupaxuzizuvidok.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/purede.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/zekajivazajazafolo.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210927_74EC161154F9B8C0.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/vumavanumuxarajozimav.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/gokidebated.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_off0000aed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED3 14600 bytes
SHA-256: 5f20c6c2a3c4f3a95750fa4c9c897485d0b51f85ce940065483c69eed98f345f
font_01_sfnt_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 10540 bytes
SHA-256: f37a6343790d0c80b7fe470ec08d896db8f7980d63c7cd6ff81a6e684a51257e
font_02_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1