Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b5acfd4ad21852…

MALICIOUS

PDF

68.7 KB Created: 2021-03-27 15:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 772cd0318ac41770cf2b610b2b821947 SHA-1: bce859747e9b55844ce83954e6e658f8f8301cda SHA-256: e1b5acfd4ad21852f425a148b7779b87239207f95a04d9539b1c1edfa050d46b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to educational content, which is a common lure for phishing documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=midpoint+of+a+line+segment+worksheet+tes PDF link annotation
    • http://makeyourself.xyz/39880334067c3uso.pdfIn PDF document text
    • http://winclean-shop.space/distribucion_hipergeometrica_ejerciciospzkp2.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/95350338814.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/Qhajcji/zara_sale_dates_2020_uk.pdfIn PDF document text
    • http://forpost-electrica.ru/different_types_of_beaks_and_feet_of_birdsj2iz4.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/44730425686.pdfIn PDF document text
    • http://rodina38.ru/75417300107tlmh1.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/985482065.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/braun_series_7_790cc_4_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/8YW8gcv/zefudogiwegotarepizoxigo.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/6th_pay_commission_karnataka_kannada.pdfIn PDF document text
    • https://cdn.sqhk.co/malasexek/cjdHRgh/christmas_carol_song_sheets_lyrics.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/fapaga/how_to_cite_online_sources_apa_without_author.pdfIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/71092362028.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/machu_picchu_guided_hiking_tours.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/celik_wang.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/nrp_algorithm_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/tinoxixekevixoxijares.pdfIn PDF document text
    • http://posikin.myartsonline.com/45190218810.pdfIn PDF document text
    • http://laxufazekez.atwebpages.com/6334122126.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_off0000cecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECF 5616 bytes
SHA-256: 5fb35206a7785b70f788979c7262862ae715557975d862333a1c3b00dbd34878
font_01_sfnt_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 10492 bytes
SHA-256: 8d8c7a98f8f840d51beba229956e67ae34906d236fef4052d0640f87be300143

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