Malicious PDF — malware analysis report

Static analysis result for SHA-256 3808e2470926e6e7…

MALICIOUS

PDF

76.9 KB Created: 2021-05-02 04:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4b8c24054e4a12ffd218ed9ab28e705c SHA-1: c3a2b878a6ec2ae930d48c34fc2d5f6e5130c9cc SHA-256: 3808e2470926e6e795777adf10de4c41d74359f646b29338ee580b235bda9d86
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document's structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dugedepap.ru/strik?utm_term=oral+b+3000+vs+1500 PDF link annotation
    • https://cdn.sqhk.co/wufotubi/rj1jfib/81856663176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_600ccc92aca05.pdfIn PDF document text
    • https://cdn.sqhk.co/xixofivib/oBDTgcA/mixupubelafamanubulit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_6027f02bf0f18.pdfIn PDF document text
    • https://kuwobudub.weebly.com/uploads/1/3/4/5/134587752/8526691.pdfIn PDF document text
    • https://rikomurisixub.weebly.com/uploads/1/3/1/4/131454733/3626239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_605f276ddc73c.pdfIn PDF document text
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/d5121e46176f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5ff201cfbefac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369927/normal_5fc6a9304a293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_e6a29c11c9b348a1ae4c34d27b9b79b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33a128b-866d-401b-9695-a169ba8f8a36/60676239221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc631e5c-a6b5-47d9-99e3-bf43ffaafe44/verb_forms_exercises_for_class_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7020b5-136c-4cdf-8c1e-b5695539ff96/starbucks_coffee_menu_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/an_imperial_affliction_plot_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/61167019265.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/28074740010.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_b2e8dd7115364330bacc047ceca3c2b1.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5388 bytes
SHA-256: b2e2e3a3d7779938ce53a9e200dd8993c50fe5029d201fc7ec025e23d5fee4d4
font_01_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 11060 bytes
SHA-256: a25ce7151792ae23eecf5fd760ad1029e5efa13269942f7094f875793970b6c7

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