Malicious PDF — malware analysis report

Static analysis result for SHA-256 499138de0c42bf18…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 09:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c528940b249d026eca8a97aa480020cf SHA-1: a4c6927fec2bca4f2bf6456593feff86d3893d01 SHA-256: 499138de0c42bf18b11956d2d636ca59c22549937b75fbe4e21e301f087fedc7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on disposable domains, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a link farm designed to redirect users. The 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to trick users into downloading a payload or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://nomylo.ru/uplcv?utm_term=forgot+passcode+on+android+phone PDF link annotation
    • http://ajeah-intl.org/fck_image/file/xikaxurosiwol.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/renogibadamesosowe.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/51316386611.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/penatupop.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/83619062694.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/fekipawileze.pdfIn PDF document text
    • https://edgecs.com/documents/doxasalukav.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zebutixazasadazize.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/71646151900.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/74001423373.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/xozujoxo.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/kusupaw.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/jagezubutanavevazumudo.pdfIn PDF document text
    • http://neteyes.eu/editor_up/lezapakuvuxorafabamotuku.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/40599728152.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/3611431295.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceec789d3d---temudavoleje.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/35087199150.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161403f275339e---41267075793.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/jetofokovevek.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/36465557861.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/xovemorimolaboluru.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/sorozajaza.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/petuwofimek.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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 10724 bytes
SHA-256: af27faf24d8c53b3aee0c766b21ff622ba87799e5dfcc7c314767ca417caa28f
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 17720 bytes
SHA-256: 4c37a8958e42b23dc61ca5b1a23565ef1f3b6447e7cd5bf36d499705a3c97757