Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e36d577a07a6a0…

MALICIOUS

PDF

76.5 KB Created: 2021-03-30 02:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 796ce2cc8a855966f6a070eed27f856a SHA-1: b2368ede6ad35b6d45bdf9229a19f59fba47aa11 SHA-256: 40e36d577a07a6a0db6518ec6449009c7900a325b28431232bee0a0824699256
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, including one pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded content suggest it's designed to exploit users by presenting a seemingly harmless document that redirects to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://jacksth.ru/award?keyword=historia+de+la+contabilidad+en+mexico+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5ff45f0c145a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_60306962e5ae2.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/hDih1Pd/57796789024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_605ee535de957.pdfIn PDF document text
    • https://cdn.sqhk.co/gojaxaxiwa/iehihbs/fondant_rainbow_cake_topper_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_6036b40b6f4e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_604afde0f2792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_6056ab6d797c2.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/how_to_build_lap_steel_guitar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379964/normal_5fc7d1c24dddc.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/YchikWJ/jurassic_world_the_game_hack_2020_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382770/normal_5ffa74c8c4096.pdfIn PDF document text
    • https://cdn.sqhk.co/daxutoxod/hbMmhgi/managing_technological_innovation.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/21709429625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5ff7f95ff1f0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f70680f6-d893-4f24-8861-0721123b3754/panofafiz.pdfIn PDF document text
    • http://zimofizamar.epizy.com/areca_catechu.pdfIn PDF document text
    • http://jozeratajugik.rf.gd/lenovo_y700_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8725f3ae-4321-4cae-a8b0-e9a5c79bf361/duriwixomisejusupexovuf.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 5468 bytes
SHA-256: fed3ed76a2cf5ee596be56e9e4976e1093a0e0382d3cc9b67bc07e25a3fa429e
font_01_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 11804 bytes
SHA-256: b6d3ce105e1445cd9fae78d614c07cac97b8c2caf72fb0085865b201f785a823

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