Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b94a1d18b5d1c2…

MALICIOUS

PDF

71.0 KB Created: 2021-05-24 04:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9e204894d3b27d194ed102512815896f SHA-1: da334e0dc19f0d67b72ff7aac4bb2f7c7d75c049 SHA-256: e8b94a1d18b5d1c2856d744cb6df2a0777fb64050761ea27ba94c742ec22a406
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content, suggesting a link farm or phishing lure. One prominent URL, 'https://seumenha.ru/strik?utm_term=1984+ezgo+marathon+manual', is flagged as a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/strik?utm_term=1984+ezgo+marathon+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494166/normal_60139fee313e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367625/normal_5ff061b09d86e.pdfIn PDF document text
    • https://gefilatokakanor.weebly.com/uploads/1/3/7/5/137501249/ad1b69230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5fe35969163d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413456/normal_5fc70da269653.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/9538207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_6017a9b444123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_60697bfaec882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_605c3cb6ca93f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_602ff92494458.pdfIn PDF document text
    • https://kigumafu.weebly.com/uploads/1/3/4/1/134131380/2b1f34e4c08c.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/bubeto/is_there_another_fantastic_beasts_coming_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47dac2b4-3047-4c22-a859-c02cab5c5201/jonutene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07820d63-ca0c-4df8-bfa9-5dbd374a11fe/intervencion_en_crisis_karl_slaikeu_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c4f6b1-615d-49c0-91c8-5601e3292991/plantronics_cs530_earpiece_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/building_construction_book_bc_punmia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3a7e69-12e1-4587-aaf0-c8a1bcb954d5/how_old_do_you_have_to_be_to_work_at_home_depot_as_a_cashier.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/76720722039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac90a274-ae9f-4118-ab33-2b089b41228a/96388687524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25500ef7-f9ac-4d43-8df9-c97b632c6019/pusetetosixitixareture.pdfIn PDF document text
    • https://www.manualslib.com/manual/637192/Ezgo-Ezgo.htmlViewIn 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_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 5368 bytes
SHA-256: 8eb8ab75d47efc79ea4ac4c8ec7022a527c1953b963e70a8c601d56c31544b70
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 10660 bytes
SHA-256: f11845bfc2061d1aabc0b1a9c302c0a103ca03ad26d4cd858e8ceb115a014750