Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ecb806868b99a6…

MALICIOUS

PDF

87.8 KB Created: 2021-06-02 17:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 81ce1753776be615f528c85cce00fca8 SHA-1: ef347bad5473322085a7b3fbce2a17ad3677058d SHA-256: 63ecb806868b99a6f2292535083701565c2b4f16edcab4287a65533f67ffab21
126 Risk Score

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 0.9967

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://gimoguvi.ru/123?utm_term=orc+parquet+performance PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4393625/normal_60b0864c12bf3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4496360/normal_60b732827e3e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454984/normal_5ffcb387b6985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5fcc9c9c64d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_606ea31d3ffec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_606dfbc5b782b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_606c69aa6f89e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365621/normal_6005d6a588c58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366398/normal_5ff9da4a265dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393486/normal_6047e89974a2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_603b0d452c137.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5ffd0c7fddbfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_604eb0ff4cbac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sizolasipape.pbworks.com/f/fanitidageraxawof.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/pokemon_lets_go_pikachu_guide_after_elite_four.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/93050269472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17ad9d4-dae2-47ff-ac0f-f45aba4eaf97/59759476291.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/kalimas_in_roman_english.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144423858/alessandro_baratta_criminologia_critica.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144456384/primark_sizes_big_or_small.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/f/43841560432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527be6af-2023-48f9-9a9b-27882f40551a/38498168757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be56d633-71a0-4375-818a-ac7cd82163b0/calorie_intake_chart_for_weight_gain.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144466215/biologia_y_geologia_3_eso_santillana_serie_observa_descargar.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144450867/nulutumojakip.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144416139/lexisnexis_police_report_customer_service.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_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 5104 bytes
SHA-256: c075f8aa9b003c5e3cede0c36da8278504107d2980bcbb5d8474c19d01b6e716
font_01_sfnt_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 12732 bytes
SHA-256: 81570b691ffead53e16e409387f9cb4223218cb69ffe45cbf32a2ea0976ec4fb