Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c449b174b5462f…

MALICIOUS

PDF

81.8 KB Created: 2021-03-25 15:34:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b5f22b497d3c6aad1ea975ffe2b22ba5 SHA-1: eae2068e20b30c3e67fccfcdbd8509e7aab90b24 SHA-256: 38c449b174b5462f72804a1f4b74a2c3901bf8115afef181b040cda57f6230b0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://xajibur.ru/strik?utm_term=best+wireless+keyboard+and+mouse+combo+2020 PDF link annotation
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/xojadogabaratutifofo.pdfIn PDF document text
    • http://thailandlove.site/luvurokexo57lg3.pdfIn PDF document text
    • https://todoxaladavefuk.weebly.com/uploads/1/3/4/5/134529573/ed03be.pdfIn PDF document text
    • https://gosawopidelogeb.weebly.com/uploads/1/3/4/7/134714887/zasonigusikaso.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/the_crown_season_5_episode_7_castf3bqy.pdfIn PDF document text
    • http://bioforcecolumbia.site/gipaxurojirelawesolofuy36nm.pdfIn PDF document text
    • http://netewe9.xyz/google_sign_in_android_firebased4q1n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/xamofazabuzisozobareb.pdfIn PDF document text
    • http://wojobawezelo.rf.gd/72943351471.pdfIn PDF document text
    • http://jarunotaso.rf.gd/centurion_assault_squad_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/exponents_worksheet_for_grade_7.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/56833296562.pdfIn PDF document text
    • http://puzuzebud.epizy.com/32304485871.pdfIn PDF document text
    • http://vadatomas.rf.gd/61153082005.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/commercial_real_estate_prospecting_letter_template.pdfIn PDF document text
    • http://rajuleneto.epizy.com/12431594618.pdfIn PDF document text
    • http://timarofata.epizy.com/what_did_muhammad_ali_say_to_jerry_quarry.pdfIn PDF document text
    • http://fumesowira.epizy.com/diferencias_fundamentales_entre_bienes_y_servicios.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 5688 bytes
SHA-256: 23fc589b097a4fefc5c167bf15e769c4ae923f48ebbce9cc1fdfe8dbca764d6f
font_01_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 10876 bytes
SHA-256: ea663e2e8bf9dcc3bff800e1723684a31e5e4aa087402fcd0b13f43df4561551
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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