Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4654dc6192d243e…

MALICIOUS

PDF

94.6 KB Created: 2021-03-20 17:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0604e0b51bb9178c73dac791cdab7b44 SHA-1: fc7a4db8069dff25d267fd79969d6ee85bf4de7d SHA-256: e4654dc6192d243ea4d0c35961780f46fac16d71ace2e71e064a86667ffba336
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document, likely used as a spearphishing attachment to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=building+energy+audit+report+pdf PDF link annotation
    • http://lbaranaydin.com/bed_sheets_online_shopping_in_pakistan6t19i.pdfIn PDF document text
    • http://agentsoft.space/oh_my_love_my_darling_lyricsrxt0j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_603e263f3d708.pdfIn PDF document text
    • http://fortuneo.biz/xapunufajozibuzamakbj9.pdfIn PDF document text
    • http://biomaniix.website/can_am_spyder_service_intervals97mkd.pdfIn PDF document text
    • http://remont-pc.website/pencil_drawing_for_beginners_step_by_step_video4o1gc.pdfIn PDF document text
    • http://submonster.xyz/tazafosu96ws3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_604b93e2e07cb.pdfIn PDF document text
    • http://tesar-krd.ru/22438654394xpsev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5fd2e7b0dce03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_605423963b72d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408476/normal_5fc6a9f404ff5.pdfIn PDF document text
    • http://nopiwez.22web.org/88240678456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_6037421bd2d9c.pdfIn PDF document text
    • http://daimontimur.org/new_york_automobile_insurance_planclm8y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5feeee29bb8b7.pdfIn PDF document text
    • http://kkkirrreeee.space/fmcsa_clearinghouse_fact_sheetqgam7.pdfIn PDF document text
    • http://card2card.live/icse_maths_book_for_class_6lam96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dexixikix.epizy.com/94473311593.pdfIn PDF document text
    • http://budokukikaririd.rf.gd/the_history_of_love_book_free_download.pdfIn PDF document text
    • http://luselobek.epizy.com/jupuxajelivuvogo.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_off0001333c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333C 5184 bytes
SHA-256: 10acb5bcc18db1830487afa353702fbf9a6f40557863235d000d8ace458087d7
font_01_sfnt_off000144fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FE 11900 bytes
SHA-256: 5c84c6e588aef54c915f53a12d6fbb928007ad16f0e20455f50276bd3442649d

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