Malicious PDF — malware analysis report

Static analysis result for SHA-256 598bf8b4df4cbf2f…

MALICIOUS

PDF

80.7 KB Created: 2021-04-30 16:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c4a1b0fab02e0bcb7860e9041f2b97a2 SHA-1: 697b3acbe7a505a51e2331ede6c4c70cad5a7625 SHA-256: 598bf8b4df4cbf2f6ec428c287709958d1c94ad58b7b5fe3a3b3294a52f9d171
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The primary external URI, 'https://pelibifir.ru/strik?utm_term=que+significa+cuando+un+carro+tiembla', is likely a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://pelibifir.ru/strik?utm_term=que+significa+cuando+un+carro+tiembla PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386834/normal_5fe25aa8eaf4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_604d0c143a734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410013/normal_5ff035f9c18e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382430/normal_60046e9befe12.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/mChfmth/hashtag_for_instagram_reels_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383798/normal_5ff9d7cda61cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_60649d9376d78.pdfIn PDF document text
    • http://jakufodunod.getenjoyment.net/37234340836.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/849853.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/your_brain_on_nature.pdfIn PDF document text
    • http://pifovabu.getenjoyment.net/36694431659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383577/normal_6008fa68b88d7.pdfIn PDF document text
    • https://mapogukokerezat.weebly.com/uploads/1/3/5/9/135987870/6648bc1c.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/art_active_release_technique_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_601f2d511894b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_6003893bc8f57.pdfIn PDF document text
    • https://cdn.sqhk.co/jaselavujuwi/fkp2Xij/80779890821.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/S0mvjdX/spelling_practice_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_60246d3fb6228.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e2412d-b125-4353-b918-d9632bd6c470/xodowisetoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33a5823-5466-454f-8141-9be706a0b43f/cyberpunk_2077_update_ps4_1.10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0538d11-3756-4fa7-971d-5d29104e7796/what_is_storms_power.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/mokefasixabejuxejolikiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6868aa3-b9ef-4a04-8032-1e224dbb999b/yard_machines_lawn_mower_gas_tank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/967c4408-a492-484e-a2a1-e512c757f7c7/29137541238.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_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 5544 bytes
SHA-256: 3736ec2b2cbd8c09e326bd0327efc24a7d46fa723a3c74b259b7e5f3239e0a1b
font_01_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 11484 bytes
SHA-256: ca602ee04ff0724897d0abd4f0d9f943fb3fc511b8bc8cbab986ad315be56d77

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