Malicious PDF — malware analysis report

Static analysis result for SHA-256 bade7dd5c79f4918…

MALICIOUS

PDF

75.5 KB Created: 2021-05-25 13:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: be2021994a7c49dda3ab2d1ee026b798 SHA-1: acb9df7935f1f5fe695aafa27b69cd1e4907b9be SHA-256: bade7dd5c79f49183f1c0e565b3f17c517b93e003b35a67dfcd3df6eb6054ea0
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which points to a suspicious domain (`nipisod.ru`) that is likely part of a phishing or scam campaign. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is designed to host multiple links on disposable hosting, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wb?keyword=whirlpool%20wdt720padm2%20not%20washing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450044/normal_60113c0d9e8f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469623/normal_5fdecbd2a265c.pdfIn PDF document text
    • https://jigadukux.weebly.com/uploads/1/3/4/6/134682377/756934.pdfIn PDF document text
    • https://gixobuwek.weebly.com/uploads/1/3/2/8/132815317/4906290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_601a4b287bd52.pdfIn PDF document text
    • https://duwutevo.weebly.com/uploads/1/3/4/5/134597351/7628336.pdfIn PDF document text
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/4139ba2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491926/normal_605449606f589.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/1695421.pdfIn PDF document text
    • https://xetakafiso.weebly.com/uploads/1/3/1/8/131856826/tovurirujojo.pdfIn PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/f2f6e.pdfIn PDF document text
    • https://wusatotaluvak.weebly.com/uploads/1/3/4/4/134469206/6669811.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/niporofez/49693212811.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/jukanasarujekipedozojaso.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/is_hunger_games_catching_fire_on_hulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd245cb-438e-4272-b299-282feed1e1f4/zowevazovozojuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed771945-5e08-42e3-baf5-de8280f65e74/what_are_the_seven_most_deadly_sins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d835c6d-9580-48f8-ad4f-55b9cd16ee6e/hatz_diesel_engine_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/31719198861.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/lubixukologajuruluridaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c04c3ca1-919e-4cad-adec-7da551c9e9b5/95017438405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d331e90d-6d91-42d5-bef1-06e5e9fed6a5/comcast_remote_codes_for_samsung_tvs.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_off0000e734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 5832 bytes
SHA-256: 32b9cac874237db29f569db9d08311b5e9b0aa56e79e21028923488c6fb1aceb
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 11044 bytes
SHA-256: 4b0fc68169bbc53ad57c87f0dcc7c304ffd0782aea013cdcc68e9ae2a30dc10d

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