Malicious PDF — malware analysis report

Static analysis result for SHA-256 25369f28196d7db8…

MALICIOUS

PDF

81.6 KB Created: 2021-04-05 15:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 032b051dd89ae11367bb8f82631a1260 SHA-1: 026ac9e98e41ac73220e4fad3ade4953a52f335b SHA-256: 25369f28196d7db827441b6a8b0da0fd34124a708d6850ab829651e5e0bcbbff
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 maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

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://cdn-cms.f-static.net/uploads/4365584/normal_602f5266ac1cc.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4446496/normal_6003ec9452b23.pdfIn PDF document text
    • http://psychologyrelax.xyz/free_css_templates_for_crime_reports8rikn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_60242e43dc38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_60171d94ea046.pdfIn PDF document text
    • http://kellys.space/kingkiller_chronicles_filmj7j95.pdfIn PDF document text
    • http://poverkavoda.website/negative_space_drawing_definitioni8owu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_6000c8ac066fe.pdfIn PDF document text
    • http://wisitens.online/475017402758nknf.pdfIn PDF document text
    • http://esclub.pro/what_is_traditional_music_of_koreaok45m.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_600f236253f67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=kitchenaid%20superba%20oven%20installation%20instructionsPDF link annotation
    • https://uploads.strikinglycdn.com/files/3fa3f0a1-f295-4218-92eb-1f1b6fc86474/tukefujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a641f3c-d409-40ca-9985-3fe631a66b22/basic_guitar_chords_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782ddaea-4d0f-4f87-838e-613f0e3b3977/can_payday_loans_send_you_to_collections.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d8fd74-29bc-4518-b150-49ca61e8531e/descargar_album_completo_de_ana_gabriel_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72bb0d88-ea9c-477b-b234-5a2a012cf774/how_do_i_keep_him_interested_after_sleeping_with_him.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2606eb92-c081-4836-9d79-2c6c3d4f7e95/39743266960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad81649-e4f2-44b8-a19e-3c477bd4b133/lizigasixifamuzab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d045b2-5db4-440f-828f-5f678060c285/xajazolebevezexoxijetal.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_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 5332 bytes
SHA-256: 308af0e4fea07737f7163753323963d9e991035897898a86ea04241a032c662a
font_01_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 10564 bytes
SHA-256: b0f1dd65f5e4008ba6726dc411818a79fcb502e75cf7854bf3cceb081279979d

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