Malicious PDF — malware analysis report

Static analysis result for SHA-256 37eeebc519a4101d…

MALICIOUS

PDF

82.0 KB Created: 2021-04-04 04:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 105560bdd8e0084b48a7b49309798a29 SHA-1: 732b16c96e63e76ffae51f1990b0436610a6fc73 SHA-256: 37eeebc519a4101db9668841a73e4327853e0833dfbcc628699482fd09fa1594
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 0.9998

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://crophysi.ru/123?utm_term=advocates+act+kenya+pdf PDF link annotation
    • https://zufezoro.weebly.com/uploads/1/3/4/8/134885884/mepaxidibijatit.pdfIn PDF document text
    • https://fojaxifolovu.weebly.com/uploads/1/3/4/4/134497744/gelewuv_bekerugitowufir.pdfIn PDF document text
    • https://nijodumedogale.weebly.com/uploads/1/3/6/0/136082157/7708434.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5feb1564ec77d.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/AieMghU/32119928820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_603d52968a26b.pdfIn PDF document text
    • http://changepass.online/cnet_speed_test6xp8t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_5fd2d1463ff62.pdfIn PDF document text
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/gorexuduvidisav.pdfIn PDF document text
    • https://vowodilob.weebly.com/uploads/1/3/4/6/134697463/f009e05cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_6017579eca115.pdfIn PDF document text
    • http://fruktovik.com/naliveu91r6.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/jbgfUlk/soxakinafukimedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_605bfd62155ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujupifirafadus.myartsonline.com/alexander_technique_for_singers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f15ad4e-c962-40ef-9057-a66d50ff9ff2/battletech_game_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee3ef40-7af5-4135-8a85-e9ac6bc3683a/91928462418.pdfIn PDF document text
    • http://dexizijisub.atwebpages.com/xikanuxekatopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b691305-f13e-43ad-8588-a402ef9f1656/pubuputaxolutefeju.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_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 5236 bytes
SHA-256: 13a4bc86496f7d85ff6a74efbc67a0439a197e71ccd9f7a22436dc2bf67ccb11
font_01_sfnt_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 10784 bytes
SHA-256: 4eb0f8e64ff936f1dd2425867ed8378d071e9fd759b177b4dc9e5245f417c001

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