Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f626e3cc10f678…

MALICIOUS

PDF

80.5 KB Created: 2021-04-06 19:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f3ab635bb3871f2a39bd09edf23d9c87 SHA-1: 288f1ebfbde759fba246a9aa274e1a059d9a0d1b SHA-256: 93f626e3cc10f678fb0bafa0d31d0bfb866a689ac0725a16864833f94b1a4d30
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing lures. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to redirect users through multiple disposable hosts, likely to obscure the final malicious destination.

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=formulas+para+calcular+el+volumen+de+figuras+geometricas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481520/normal_5fcfef27290ec.pdfIn PDF document text
    • http://logoped-samara.ru/energizer_battery_charger_specst1dwn.pdfIn PDF document text
    • http://drenajkrasnodar.ru/exercicios_tabela_de_frequencia_estatistica_docwryn1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403407/normal_5fc907136cbed.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/ihhjhCu/amazon_gutschein_kaufen_online_paypal.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/hb1geXx/zamuvasexilat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489838/normal_606c30f0cd570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fd7bae216cab.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/how_old_was_the_cast_of_vampire_diaries_season_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5fce4e20d1962.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/jg3CKgc/65740219872.pdfIn PDF document text
    • http://sinomefonok.mywebcommunity.org/passport_application_form.pdfIn PDF document text
    • http://birjand.design/dragon_ball_color_manga_downloaddc20h.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/pulavokaxe/47863077681.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/alteraciones_del_lenguaje.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/nudolelarivatufefarapel.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 5488 bytes
SHA-256: 948972b7d0a61c37d23ecb612c21f8e5832a072f15db27d25f1da2f8f44e441b
font_01_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 12168 bytes
SHA-256: eccd99a259ac980b6173445f5e7e95ae26b3077b829e333f3639f5383902da27
font_02_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 16196 bytes
SHA-256: 26d35e1383085e9cb9d4d21dc57af34f690a59e5e018f3061624371f6fe277e7

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