Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e64092dc2b0911…

MALICIOUS

PDF

78.8 KB Created: 2021-03-11 18:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5da28496011af2abd9956910b880147c SHA-1: 460aba2f1c846796f2e7be40be48eba544f0386a SHA-256: 80e64092dc2b0911ff41765e7d02def9dae0f0283f4dd8de22db5abbea4a21c0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, appears to be a lure related to "Huck Finn movie questions and answers", directing users to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=huck+finn+movie+questions+and+answers PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_70dd382f54d6440c86a1e7dbd1dd8152.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/938b94d8-0bd1-4ea0-8773-577a2a0acb5a/guitar_songs_free.pdfIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_a13604fca96a41b9af4c86fc210d2089.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06593c51-e81b-43a6-831d-d463327444d8/singer_futura_software_problems.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_ece4373606254e4b82ee9dd2ea095897.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_ba2ed15d2c764cc0b5c0b3887fa36140.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_1481490b949544e0a63a20224d2c59d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee420e74-9763-4b89-b065-1d79d07ed29a/gejogamosero.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_8e2d97a5098b4832bece055655c1a94d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ffdf61-812b-45c9-8f01-bff573736d28/foxabasu.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_e4f6776b71174ec0844b00f0485df285.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bbdac21-4c3e-46dd-856b-c41ebb2b4b66/kifikiwop.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_ff791102fa4b4161a93f5a1b013ceb7c.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_b6ba4d74a5054d389d7f815f09c64749.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c37c900-b018-418e-a04b-51d4a259445a/how_to_clean_an_arctic_king_air_conditioner.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_8b57e124e5e145c5b4a40e4ce435ac1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1057292-1a10-4a8b-b9fc-417cd10d04d1/barska_safe_keeps_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d75091-8abf-495a-ba6c-9b8f26132b8c/2414515949.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_ea2b1f7a87ef4d3cafd8c0a8fe69d894.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a838d8a8-6895-4633-8bcf-5056158d8722/once_i_was_7_years_old_lyrics.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_10c0aac4f963430b83f889a8107dd52f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99078159-d801-4690-95ba-40d4974d3ade/yaar_nuri_ztrk_siyasi_hayat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59668b3-9d28-404d-997b-cd9c32266919/legaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01f0910-3de3-4a5b-bbda-84d2b75175d7/39902659838.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_82732db75e134e7c937cb7562464fd57.pdf?index=trueIn 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_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 5436 bytes
SHA-256: 939d96ddbbaa30d46f2b709eb8d3d4db6bec410848733953c8318736061766a0
font_01_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 11192 bytes
SHA-256: bfceb7cedb12e0e7c858e3acb5ad5c83a01b43714521b6deeebb607ec5813c6c

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