Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10c515644e6d3c4…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 03:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e990b176d3dceb32a2eae44decd4fdd4 SHA-1: f77ae76f2e2688876c635686ee9ad46dc3294971 SHA-256: f10c515644e6d3c4c2e684f3c410bbd7e3c03feec924e92c8940953abc4a9447
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and heuristics point to a common PDF-based phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gysanya.com/upload/file/2109032342421198914zl9ue9xdxiy.pdf In PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/92772965293.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/32821407746.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/guvipenavipidinu.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/32579383683.pdfIn PDF document text
    • https://luminex.pl/upload/file/javoniboren.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/babis.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda04b7932---japerefokinidezisamum.pdfIn PDF document text
    • http://pneusmarene.it/images/file/gasumeliresuwu.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/50306480862.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/zunoteviwenodofurel.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/62583152214.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/62710883638.pdfIn PDF document text
    • http://regmac.net/userfiles/files/87194803022.pdfIn PDF document text
    • http://puisan.ru/uploads/file/pujunamoduwipegumapewaw.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe794ab5e4---88327086575.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/3695173082.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/69773409579.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/tuzefimovowonedesiwuzale.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/zeziretalo.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109070925264598.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/xanigopuve.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/4423211020.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/29511597064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=monster+hunter+unite+isoPDF 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_off0000c39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 16516 bytes
SHA-256: 3742f08eb9bf315c642309c06b0860dd1578d7de9c901ad8771dbf7ed4b8ec54
font_02_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 10092 bytes
SHA-256: e5ffd8cbbd690e3872b53dcd15cae95aafb73c7df925b344e71a0c60656862d1