Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8e6dd235e42887…

MALICIOUS

PDF

86.9 KB Created: 2021-09-18 22:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07af5efb0d3e504a7a97d28af62229de SHA-1: 45d4f5b2a9563116c193657e7db46a7213c5428e SHA-256: fd8e6dd235e428878d4fdd7d092e979a7915d33cfe083032f8c36c59cb894660
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 phishing or trojan threat. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent of distributing links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://fskyok.com/uploadfile/files/gujametufasiwuziruw.pdf In PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dufowezekenoto.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48808597337.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/sukaxex.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/kugesabakox.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bc1dfc653eed0f9354cf1860ce85199/zotaxeguzoweva.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/31406702107.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/9380305754.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/76258928237.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/gadivipilesaxonejebojix.pdfIn PDF document text
    • http://centromp.it/userfiles/files/81838708577.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/rujuliter.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210903040328.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/49035844947.pdfIn PDF document text
    • http://iscelenie.info/files/file/fisigiwiwigirijekil.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5adce58ea0acc3a9a49c3c22866c42a4/vudiguli.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/riposuralorukix.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/83064946190.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/sogugisekiwekilodax.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/28494540898.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/gejatibet.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/2949948477.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/48364484518.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/21642860191.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/lipujogorugevabakezem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=app+package+and+app+activity+in+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_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 17168 bytes
SHA-256: 0604416083cebd90cb31b9a1c43b7ed4e18445855ca7f2c330003914dfb88b2e
font_02_sfnt_off000134c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C6 10728 bytes
SHA-256: fdcf1f0b7d3a1a16c4a678871a46007f1e910c47138bd045d6244b55971db53d