Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d741a545ca5273…

MALICIOUS

PDF

80.9 KB Created: 2021-05-19 21:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9bb898bb0cbf05eb8147433016c42304 SHA-1: 55dd9dcaeaef032cc415e1cd52392534228d6e94 SHA-256: e3d741a545ca527339fa67574754ee6534dd55735958edf56a90e30f83620cd7
186 Risk Score

Malware Insights

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

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 0.9995

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.
  • 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://xajibur.ru/strik?utm_term=annihilation+of+caste+original+book+pdf PDF link annotation
    • https://birisudim.weebly.com/uploads/1/3/4/4/134467091/nugomina-xizunilugig-murimedex.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/ranozexof.pdfIn PDF document text
    • https://busejutepegojo.weebly.com/uploads/1/3/4/7/134773147/4087463.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/33b2810752963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_6058a14770808.pdfIn PDF document text
    • https://dujuwugad.weebly.com/uploads/1/3/4/7/134721680/3e77b3482dc62c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_6062cdb12b27e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bf7f6f8d-a6f9-4c50-bd9f-843059f30b96/voyager_edge_of_solar_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4adcf318-4478-4c46-91c4-e707c64b6e31/toastmasters_table_topic_master_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a1f65a-f440-4c59-8f4d-ed9bb054a9a6/fopitaxuvevudukamigek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439645a4-3b1b-4751-97c7-7e6f40a542fd/atributos_de_dios_a_w_pink.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/meguvapigubikoxinap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3547df-fcc3-4660-8e73-f0eb9f8e8dbd/how_to_reset_samsung_fridge_ice_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd6c5c0-ae84-44ef-affc-71cafa9abc0a/82403022038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a5b0c7-7a75-44c2-81cb-4f597a7189eb/best_compact_washer_and_dryer_for_rv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd1a3c9-bc02-4aab-8d7e-94254255ce27/51395463202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a26c9d2d-3b40-4a96-bb53-2a46e0202eb3/76448434254.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/46210392162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413478be-38ec-426b-9784-077c72885f69/mackie_cr1604_vlz_schematic.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/81378204006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f909705-4786-443f-b7d3-36cbf0988b17/4087521524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86e94ad-f03d-4e6e-bfc8-34ce994b449a/judith_butler_performative_acts_and_gender_constitution_summary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 5400 bytes
SHA-256: 8760b8c006e1387b4769ef8e82fb58a1cf2aabf4b09bc834c6e1b4b9fcabfd37
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 10940 bytes
SHA-256: 8d5005eda50ddee1d8bf99096fa32154387e22398ec5127f12af3dc15d2f375e
font_02_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333