Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b2cd11f23873f9…

MALICIOUS

PDF

71.0 KB Created: 2020-11-13 16:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7a4b2787dadd20e5e33940f50108e405 SHA-1: da748e7b072c3cbdd8754f0154d4764b45657a7a SHA-256: b0b2cd11f23873f9d47ec1f34dac742249f40fb9b4f4443328f312b1a562af0e
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 0.9995

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://trafffi.ru/strik?utm_term=el+metodo+analitico+sintetico+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5f8a03ddea681.pdfIn PDF document text
    • https://ruwotepileta.weebly.com/uploads/1/3/4/4/134493455/xazuzagiwi_letisofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466689/normal_5fa49d3de5acc.pdfIn PDF document text
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/sogem.pdfIn PDF document text
    • https://dedezeke.weebly.com/uploads/1/3/4/4/134494225/babiruvuf_mukenow_vesewivef_wideniritama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/engineering_drawing_text_book_by_nd_bhatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a96fe9-ed32-4c8e-9000-acb07a58c5e3/99421722043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3630240-2570-44a5-9e0f-3fccbbd99b0c/19723548916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18608aa-d7e3-484b-bb29-a2dd0a5b82c3/33699666072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae3f462-f9f9-4195-9703-2f816a10694e/ferewapiximawafitiwepeni.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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 5164 bytes
SHA-256: f8d8d432c4fea8040d1cb93c7a905c37fcec5acc4f17a27f0f300fe2ebfb70db
font_01_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 10920 bytes
SHA-256: 90b7df6f378aaaccb8af37431081545e1aecd188d9eed15c207ef1b4d146b8b8