Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6d0f637cba6a89…

MALICIOUS

PDF

65.7 KB Created: 2020-12-22 19:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b518d7ffdd9c13c4f509d6fa572b81f6 SHA-1: d9dea0118eeebd24917172a1c244867cca764b3c SHA-256: 1c6d0f637cba6a897384833cc0835560db708752314b9be125e64fefb982ec5d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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 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://traffnew.ru/strik?utm_term=cursos+de+ingles+de+negocios+en+linea PDF link annotation
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/mufixulufemumir.pdfIn PDF document text
    • https://paxixikepidak.weebly.com/uploads/1/3/4/6/134666626/wokoboko-vemuluwus-bivawo-sunafinozenajaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5f9a58d6caffa.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/7afb3b71-356d-4e0d-8434-d3960024c89b/nopizawetuxoretebuwek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/057c14d4-1ae0-4ec6-868f-063ba494f6ec/legunemawakenurebixuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee179b4-5918-4805-9639-ad903b7959ce/the_crop_lien_system_bad_for_merchants.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe19c8a76de9d7d8ec643df/t/5fe1f62f23faae37ab2cadb7/1608644144219/kaun_hai_woh_bahubali_song_lyrics.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc518c716f6d44b07d9a43f/t/5fd064805347e801a81fa50b/1607492738181/koxupidod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7dc3dfdd95b60d4c91c/t/5fc36d08f8cdb769c64f1fd5/1606642952918/bl2_gibbed_codes_class_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404f22cc-bf76-40d3-a7a1-4b4242f532cb/60623587367.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_off0000c2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DA 5012 bytes
SHA-256: 9522443a7d2abdab88e4113a01615c12eda09783528dac8f4b7e4d3e9d694d43
font_01_sfnt_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 11304 bytes
SHA-256: 8b3d1f1ed00d2d09bdeb0d0201b7ca2721c403484eb73b3cddb68ab83d888d36

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