Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d525987639e7e0e…

MALICIOUS

PDF

73.3 KB Created: 2021-03-06 12:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d66248160855c80de9eb8a3e08908a4 SHA-1: 754c82e92f20d7efd0ae7ce5284261d669729e5d SHA-256: 1d525987639e7e0e31ea3377c8055ea5dee28560192114d5eb64a703b107abec
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/aws?utm_term=what+are+the+basic+weightlifting+exercises
    • http://bimoriz.getenjoyment.net/dunarebolipeke.pdf
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/ded98af5fd5c.pdf
    • http://nageramuvepom.mywebcommunity.org/what_trees_grow_well_in_central_florida.pdf
    • http://pogawubujogeje.mypressonline.com/too_lazy_or_too_lazy.pdf
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/dodoxotokaso-jekupeba-kewawomolorukig.pdf
    • http://vanimerukaguto.scienceontheweb.net/91571773857.pdf
    • http://sollabs.xyz/xizenologubobidofajollv5n9.pdf
    • http://bella24.xyz/nebabusebixovifetiwazoq1uok.pdf
    • http://4d-5d.com/90323473478g5281.pdf
    • http://instofficial.online/vinawujojivoxevesopbima.pdf
    • http://ligumexijigab.getenjoyment.net/do_strong_acids_have_strong_electrolytes.pdf
    • http://wemuwetafivaxe.sportsontheweb.net/sasavirigonuvurid.pdf
    • http://vladport.ru/xavoju6lsq8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://donijexufenu.onlinewebshop.net/wonuze.pdf
    • https://s3.amazonaws.com/libowebujakux/71639431708.pdf
    • http://sofibimibojas.myartsonline.com/what_jobs_bachelors_degree_in_psychology.pdf
    • http://titugol.atwebpages.com/59391419003.pdf
    • http://fijorolur.myartsonline.com/singer_simple_3116_manual.pdf
    • https://s3.amazonaws.com/difigomisosak/30710752908.pdf
    • http://zikoliduxa.atwebpages.com/71666142622.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ec.bin
54fd1200e36257f48884899819925cec724ce7e04ee4b5d04b6178a80962192f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 5456 bytes
font_01_sfnt_off0000f497.bin
abad305ddb34ac7996f7b2b65ac7e4859397a8a3630648aa8a5c7e1473e661da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 10328 bytes

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