Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca2a9b7285ebdd3…

MALICIOUS

PDF

72.8 KB Created: 2021-09-28 20:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e0b44a2f5a608d77b3387680dfee6c8 SHA-1: 16b5f06c78a3f161390ca96406a8be4ee2173612 SHA-256: eca2a9b7285ebdd3a516f6189606b5176405e83c09a75f17555ab73ba57e89e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to manipulate search results or distribute content via a network of disposable links. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://shindah.com/images/ckeditor_img/files/wipuvale.pdf In PDF document text
    • http://as-eng.biz/userfiles/file/58567243210.pdfIn PDF document text
    • https://educhina.mn/editor/files/baxokoxol.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/mamesutixowig.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/kojapofawifobiladukezij.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/kajopekolepuwegagodi.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/73346083888.pdfIn PDF document text
    • https://lasanisports.com/files/towisuripenenudisatol.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6142db13c7066.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/renosonovu.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/10284638612.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/gomekekoxixuzaxukudikinut.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/wurakavavu.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/61313884668.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/92220545879.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/renamukabomepa.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/jebesalopezapenowol.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ace78bf43b41c0d8e5ccb357937e5466/wilipebezobuwufaranerukor.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406504665c6---musabifadumepuronoj.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/30972104003.pdfIn PDF document text
    • http://fnathservices.com/upload/file/60160161038.pdfIn PDF document text
    • https://selispin.net/calisma2/files/uploads/kobojorekoxete.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/tuwax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=adobe+premiere+apk+fullPDF 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_off0000b700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB700 18244 bytes
SHA-256: 74168bfe8a8beb2969b7dc9c44d86967cff86d3242d24741fc04400c59072258
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 10604 bytes
SHA-256: ef6ee1d1f70edb0c4773a0201102563cb2dd8a615ec7f4e9c5c916fc35a8747a

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