Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca558032280b8cd6…

MALICIOUS

PDF

67.3 KB Created: 2020-12-05 18:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bef08e7e0c447d0acfc4e909bbf9a2f3 SHA-1: 7bd6c9221c08b8d5bd8b7aa864c6c8ceac539cae SHA-256: ca558032280b8cd695f86a32cc40632a04fa4cf4aa873676201fa3e2564af2a0
164 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 and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/aws?utm_term=wedding+agenda+template+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421201/normal_5fb8f6535f278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5f8a01cf3bf4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475203/normal_5fa54dbecc6dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5fbc861f2bf29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456420/normal_5fb48a364ffd1.pdfIn PDF document text
    • https://wovebisaji.weebly.com/uploads/1/3/4/6/134687394/8003690.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5693fbe9b693951291b9c/t/5fc8ce56ec83506b04830372/1606995544373/free_full_mp3_downloads_for_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0b65f8cdb769c6aa6a7b/1606290278605/free_download_coraline_full_movie_2009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa3902d-f11c-4d5e-8b5b-9838bac8824c/discord_mute_button.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f73d1c8c741314321d77/t/5fc3270fe18c5c478e62af7f/1606625043084/university_of_nebraska_weed_identification.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_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 5196 bytes
SHA-256: 8b3d8e391dab79cf35af92d60af7a48544d929e6c77156eb5762f68e7c445580
font_01_sfnt_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 10520 bytes
SHA-256: 7f176f0cd6cf56186b977baa1e68e94f410a0e3575b53ec5063d4624d1032f21

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