Malicious PDF — malware analysis report

Static analysis result for SHA-256 8599117737b59194…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 05:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67f42f4e555227e1ab217344df5f8f9f SHA-1: 97e6d6b12a93125a781dc033877382d608830377 SHA-256: 8599117737b59194d5a410430afeeb1bae619faca4e8d850a533d930d236817e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of multiple external links points to an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://banghetretunhien.com/media/ftp/file/46210260426.pdf In PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/46337319002.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/doretuvugofosugifasap.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/55031525564.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/56972352672.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/18069119174.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/94801301338.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/lalekilivokoxedugisiwagi.pdfIn PDF document text
    • http://packamate.com/userfiles/88383939090.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/48255096534.pdfIn PDF document text
    • http://napiarsaigh.com/images/mewudu.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wexipumelaxulajufiwu.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/76914018845.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/60490411171.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/jilegezazu.pdfIn PDF document text
    • https://ptogel2.com/contents/files/31610983746.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/30897674334.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5d97faeda0e3e5858750f564329a2486/webogobaderebu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134177a982ee---batupozawel.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/rosalajiwekebenoti.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/masezupajijudowesuko.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/40463081878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=play+store+the+amazing+spider+man+2PDF 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_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 17732 bytes
SHA-256: 9e35894e231a81c0889c4ab3d85b39ecff8e2c4e82412afccabd3d1bf27bbe25
font_01_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001271e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271E 11136 bytes
SHA-256: e2a923aa6dd2adb74b7aa4e6f7564e6227dd551517c3370d7d8132e51810df74

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