Malicious PDF — malware analysis report

Static analysis result for SHA-256 e678a4710c04e5e1…

MALICIOUS

PDF

77.7 KB Created: 2021-04-13 08:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b447a6a5b146012c05e3373b955a9bf3 SHA-1: b14c3ca34aa3aff9f5108141528d9191e9c06d8f SHA-256: e678a4710c04e5e10501805dd3f3fd5e5957a5301a67dbab9923cb7de95e370a
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a phishing lure, specifically mentioning invoice or payment language. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URIs, including suspicious ones like 'xajibur.ru' and 'bcpzon4segurabetaviabcp.com', indicates the document is designed to redirect users to malicious sites, likely to download further payloads or conduct phishing.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xajibur.ru/strik?utm_term=the+postman+always+rings+twice+%25281981%2529+movie+posters PDF link annotation
    • http://bcpzon4segurabetaviabcp.com/38111428418c9u6p.pdfIn PDF document text
    • http://uscovidcharts.com/90130559464r3bbu.pdfIn PDF document text
    • http://karaulovlife.site/gilesivutavq4ar.pdfIn PDF document text
    • http://meetsol.xyz/how_to_write_epsilon_sign_in_latexaaz7c.pdfIn PDF document text
    • http://lovechat24.club/95503059758qnzhx.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/iiMaLfa/60872601734.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/eT2jdhc/tennessee_titans_schedule_2020_home_games.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/gjciiLV/25163058800.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/ijfgiEr/katusu.pdfIn PDF document text
    • https://cdn.sqhk.co/bivotiboma/PsjYgd4/dunixusojaguru.pdfIn PDF document text
    • http://uscreditmonitoring.info/vaxazifelugaxutomojy5dv.pdfIn PDF document text
    • http://natbeach.space/go_kart_go_ultra_apk_uptodownosao3.pdfIn PDF document text
    • https://cdn.sqhk.co/jedetanepiz/uXcgdo3/24708093960.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/cdce8956-cc17-42e1-9eef-0edd61ef962f/lost_islamic_history_in_urdu_language.pdfIn PDF document text
    • http://gujugune.rf.gd/transformations_in_the_coordinate_plane_worksheet_kuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f075bf1-0d81-4fe0-bde2-1feb6dfb8a54/the_theory_of_multiple_causation_states.pdfIn PDF document text
    • http://kevatudoritek.rf.gd/eclipse_for_java_64_bit_ubuntu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/433fd626-839e-42c1-9dd4-7daf2026ec0e/vawovupifurategugudowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b73e7e-c16c-4dfb-8028-06485a59480a/aston_martin_dbx_suv_price_south_africa.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_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 6104 bytes
SHA-256: 49a9a9952d9b9d2fc88d2398ea5572a4b6b4c224007bd3197e402ad2f2c63669
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 11104 bytes
SHA-256: 5a7954e3434342f6c1ef842312bc54f72e5ba6f02f8f8c9746387a5c9fd82fef

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