Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b4641e0b23970d…

MALICIOUS

PDF

79.4 KB Created: 2021-03-16 06:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 62c03269aa1b73c2d63196adf099060c SHA-1: e93cd614d41370768b4a2d1dc338d4a7c7b6105e SHA-256: 45b4641e0b23970d4ba6551bb56b9e1a258c6037629a759ec412b88a516432f3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially corrupted, suggests a lure related to children's books, which is likely a pretext to drive users to the malicious URLs. The presence of external URIs and link farm characteristics indicates a phishing or redirection attempt.

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://gimoguvi.ru/strik?utm_term=short+bedtime+story+books+for+toddlers PDF link annotation
    • https://cdn.sqhk.co/juduxijumijo/lheJOXm/17200635351.pdfIn PDF document text
    • https://jebunofom.weebly.com/uploads/1/3/4/4/134468214/vewudifizijoxude.pdfIn PDF document text
    • http://xuponigivixi.66ghz.com/nazegevifizidavoxoj.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/dghbgdI/fake_braces_camera.pdfIn PDF document text
    • http://fidukafe.iblogger.org/dinah_zikes_teaching_science_with_foldables.pdfIn PDF document text
    • https://xonamova.weebly.com/uploads/1/3/1/3/131380547/batodoz-ganoli.pdfIn PDF document text
    • http://kalides.22web.org/wugugivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_604aee99c0659.pdfIn PDF document text
    • https://magagitu.weebly.com/uploads/1/3/5/9/135959352/a2ce3338e8f8.pdfIn PDF document text
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/de172b297dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451363/normal_5ff97875767de.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/nopubejizutirojo.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/rnnhiIB/autodesk_maya_complete_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/wanowofimaz/chgiaHk/24721948486.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/fU4v7ib/call_of_duty_warzone_mod_menu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/avira_win_10_64_bit.pdfIn PDF document text
    • http://zizajurowetomej.epizy.com/zojironapudepezovexogep.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/55905718608.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/57853464018.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_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 5348 bytes
SHA-256: f4fe9a0f795069e678f88edf3efd0ed994469398cca8a7fc49a450466660bedb
font_01_sfnt_off00010b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 11024 bytes
SHA-256: 3bd8639ce5ab0a3a659a13845c68ee5d88a68b24dc6070652c36e02992da8c7b

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