Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3900ad1d479ec41…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 05:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d50ac796f9f2a4d08e2757b0e9b25217 SHA-1: c995113a6e1e0f38aa942eced6d562d31cdc0d47 SHA-256: d3900ad1d479ec41b221ca1729a377a5a01c3cceac6bd6ca5a8c63c5e6d25e53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or phish for credentials. The embedded URLs point to various PDF files hosted on potentially compromised or malicious websites, reinforcing the link farm and distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thingsantiquesla.com/userfiles/files/zimurapunidag.pdf In PDF document text
    • http://jncs.kr/page_data/file/20210904053505.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/sexujune.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/natojowufamilorebeku.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/17008714525.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/lazomepobegusotejerula.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/55396711463.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/55871069236.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4cf4fa42---69932716923.pdfIn PDF document text
    • https://trexanh.net/upload/files/93056903044.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/gavosixorimalizulivofexim.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/livedejirawujopori.pdfIn PDF document text
    • http://napiarsaigh.com/images/wopujiwokadevuduku.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/91187553314.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630722026.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/23475554367.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/8570917041.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109080628581798.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109100431348833.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/87188764085.pdfIn PDF document text
    • https://grnca.org/img/files/files/jikizifusu.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/74432756652.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/livozilikotalerutanimip.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130753f33171---70141655230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+put+a+google+search+bar+on+my+androidPDF 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_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 11392 bytes
SHA-256: ec3ab6297f856da24f6b3125a2ed0f70adf3ed00c22e2e05f590360952dbebf0
font_02_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 16784 bytes
SHA-256: 40dac71bedc379998de59d5caad8028092b9211f1917000ada69a3d18c1759f8