Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50e9ef5dde6ddc9…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 10:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1e524ceefc71821cf2a8d5ac4f2b7da2 SHA-1: b22dc7faef8673d886783a9c03807f0cca1ed0bd SHA-256: f50e9ef5dde6ddc93d0074ed7c5d229ec231ecbf4043dd94057a1760a9b074be
134 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 as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=veta+spoken+english+book+tamil+pdf PDF link annotation
    • http://cardioactiveuficiale.site/vitamin_d3_deficiency704qt.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/dirt_devil_power_max_pet_upright_vacuum_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_603ccb0ca48e2.pdfIn PDF document text
    • http://zuvels.xyz/does_office_depot_fix_computersdqjy2.pdfIn PDF document text
    • http://idealica-official-it.website/zulupazlu3dm.pdfIn PDF document text
    • http://milanomodaitaly.site/how_to_turn_on_live_traffic_google_mapsv0wpb.pdfIn PDF document text
    • http://pe50off.pro/wenakavefivu1ryki.pdfIn PDF document text
    • http://itanto.space/duxolupan38zr0.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/58447570581wsipf.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/dell_poweredge_r740_manual.pdfIn PDF document text
    • https://xijananok.weebly.com/uploads/1/3/0/7/130740199/9158c9fa3340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377936/normal_6003e1e1df896.pdfIn PDF document text
    • http://fitokapss.xyz/kabuzitunafa7j87f.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/13560291889.pdfIn PDF document text
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/rawafezaro.pdfIn PDF document text
    • https://xikigojajutu.weebly.com/uploads/1/3/4/3/134385057/timefajaguvizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/jaxolaxidotosuf.pdfIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/algebraic_expressions_formulas.pdfIn PDF document text
    • http://zujisofivo.onlinewebshop.net/hornady_150_gr_300_blackout_load_data.pdfIn PDF document text
    • http://wazipegemezen.atwebpages.com/cancionero_chileno_para_guitarra.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_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 5528 bytes
SHA-256: e3eb59666d9d63011bf4012ef144b507607f6236737aa5bdc318266ad5b9dec7
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 11032 bytes
SHA-256: 38a7b32c4775aa251a0fe305846103d45c8631fdd726b54cee9623e7a9c60026

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