Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f23e3584ee09e5…

MALICIOUS

PDF

75.1 KB Created: 2021-06-01 14:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c59bfe54e31febbdcda29294b8f6ecb4 SHA-1: c2072235ef7b5c16e69eb12def9abd606b441629 SHA-256: 03f23e3584ee09e50e7a1e1c3af4557afd19e343a49df1d1dde1bcb6149199f5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/123?utm_term=against+medical+advice+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485689/normal_604d2c1582634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_6067223859d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_604eb04f3c464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_60136a6180a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488806/normal_601570c8e6ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_6062f6f6c0d9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414353/normal_5fdccf06a33a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5fdc445ed7951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_6003956aee997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5ff671ea38b90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406454/normal_5ffd99bb80398.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwedano.pbworks.com/f/ganozofafonenow.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144452997/tepudukobububoxomanutozof.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144418011/wupamage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72363f6-5410-41df-8978-2e49a9e1bbb3/cambodia_tourism_statistics_report_december_2019.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144412041/kulaguwerirulamaxuxegu.pdfIn PDF document text
    • http://naxenuve.pbworks.com/f/how_to_unlock_your_phone_carrier_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60dd156-915d-4162-83b1-2b18d19c63ee/how_to_calculate_slope_between_two_points_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fc360d-f43f-4007-82ac-b46b04249d4d/definicion_de_materia_y_energia_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b63cc6-1ef1-4b47-bbcc-7e7490a8eb99/58872195397.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425343/wubamad.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_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 5392 bytes
SHA-256: 991951748db029407da172b11879c29381df42d5b93e417e4543b75fc3b048d8
font_01_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 11332 bytes
SHA-256: ace5685c527341e081e1e6a9e17e3fad5e621dcb866bb9cade4de088914a8eaa

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