Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ba3eb4f4bc605b…

MALICIOUS

PDF

67.8 KB Created: 2020-12-01 23:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4954477cd7549742553178e477dee813 SHA-1: dde86aadd16f1792bc938dffe0e61f9a9d0b0a72 SHA-256: 21ba3eb4f4bc605be6a39995afda7b03723607498bd4e64dd916cede3d88d787
156 Risk Score

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 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=comparing+slopes+worksheet PDF link annotation
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/4106527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5fc50435e041c.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/2735623.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/5fc2816b0a2757459bed19f0/t/5fc4c5c63c6ccf69f3f53b1e/1606731210032/25044494534.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe16623570fb44d1cb3934/1606293093622/parking_fury_4_kizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/986746b9-16f6-499c-abe1-d8eba932b3bb/mijiladuxi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2b72bbd740658066ec4/t/5fc22e1d145a8629dcf99457/1606561310545/wwe_mayhem_codes_list.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ba3b0a2757459be1f9cb/t/5fc0f09ef81c9a2a0cc44480/1606480030610/jeanette_adair_bradshaw_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4bb599-1b7f-4b8b-a534-e063870e0dc9/mp4_hd_movies.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_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 5292 bytes
SHA-256: 28197df8040760b40b5f2c86d2589e1c1b09fd5fc45be124cdd23c83f94a48dc
font_01_sfnt_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 11372 bytes
SHA-256: 0c9b34317129aa015dfeb12bc811561aee24fcb8a8ab5f3b06bcbe58747dd1a9