Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5509dcb825b1d0…

MALICIOUS

PDF

74.5 KB Created: 2021-02-28 06:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 810f17ae48657f1c6f3f2a51721241f8 SHA-1: 92c70a322e64bc648addafb81eaf2fd46fb8c691 SHA-256: df5509dcb825b1d0da533693e019c9522f2b41ecdccfe329734c901df6c21f76
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a domain associated with link farming and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/strik?utm_term=what+is+a+manufacturing+trade+deficit+with+china PDF link annotation
    • http://present-mag.ru/golf_my_way_jack8jqlv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_600f74e19383d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_601e5c91d9823.pdfIn PDF document text
    • http://shtampshop.ru/miwibazivu55qr2.pdfIn PDF document text
    • http://cashbackmoney.info/44682652542uobg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_602ea81caaf33.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/64037988973.pdfIn PDF document text
    • http://agent-spv.space/bodyboss_nutritiontyhe6.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/iVibhdO/crystal_soul_card_games_ccg_pvp_arena.pdfIn PDF document text
    • http://bupro.asia/joditibilevetutosimebw05e.pdfIn PDF document text
    • https://dasibovuripuxub.weebly.com/uploads/1/3/4/8/134860981/ketifewosumaxugor.pdfIn PDF document text
    • http://euroshopmn.space/wild_animals_coloring_pageu54qt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumamuv.myartsonline.com/zunubipu.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_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 5508 bytes
SHA-256: f2bf018d5f7f736cde3c3d20aa0fc5780cacd2f2123212d770911a8207e44841
font_01_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 11244 bytes
SHA-256: fd88c010fa564539d51f669597728fa2f7c1aaedbf346cce548ebe2092b8cd0f

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