Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcae48616011aae…

MALICIOUS

PDF

113.0 KB Created: 2021-03-13 14:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 407efa1e478d855bf419792bf1900123 SHA-1: 1081427181ef3b13c0d136b0a909dc3b97fe7d88 SHA-256: 5bcae48616011aaeb5229cc9f376e5e72cc5e7849f6e775bbd0427eaf0ed57ef
186 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. 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=how+to+ls+swap+an+s10 PDF link annotation
    • https://cdn.sqhk.co/gizoxemovefi/giiiK81/top_up_lebara_card_online.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/cggjbjh/54745487911.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/lixevufadimob.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/ggjmgfU/top_cool_ringtones_2019_list.pdfIn PDF document text
    • http://vufajed.getenjoyment.net/41742016516.pdfIn PDF document text
    • https://cdn.sqhk.co/lirotigi/vHGmFid/canberra_raiders_theme_song.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/jegigcG/best_buy_south_austin_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/lunilageruvu/UP8xha3/nsfas_e_wallet_application.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/ZhigdIg/ikea_desk_hack_gaming.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/8a7b2de9-3533-4462-ab20-6ba2431505a8/howls_moving_castle_book_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6a0144-c90b-4924-bf66-5cdf62c63127/vikepewoxek.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/6340872280.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_8bb36cf425ad4502aa172bdd25ed2597.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/nimavizugozatude.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/pibowasupunekexe.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_36c27cbbc5fd4e129b330120fc980284.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vokeri/xewoxagixamipikeweduleb.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_off00017dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DFF 4964 bytes
SHA-256: b276fa388f50b794416f3ba4c6df1e78c8c1a1a17427d2348106e59af2ffeb6c
font_01_sfnt_off00018f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F0C 11672 bytes
SHA-256: 19079acead2a099f17d48dbd992080c443143918933b1acc9750676def9862de

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