Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc3a1eb4e4d376f…

MALICIOUS

PDF

66.7 KB Created: 2020-12-23 16:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0b1ce36a9175e5cd40babc0e9d04db15 SHA-1: bd86d668d5ca84bfabd375ddc3fba1a99a715117 SHA-256: 6bc3a1eb4e4d376f91698d631250bf7f36d2d22ebad720ca0949262f5b46a9bc
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and PDF_MALICIOUS_REDIRECTOR_LINK confirms a link to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and embedded links are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=free+clarinet+sheet+music In PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/2997017086cfa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_5fa34e7b1bbdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5f94964cd4dd7.pdfIn PDF document text
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/rewujotitavi.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/6741250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5f8d9b96b36c5.pdfIn PDF document text
    • https://xegiwegaravobus.weebly.com/uploads/1/3/4/0/134017761/672fb3.pdfIn PDF document text
    • https://dawifebenunu.weebly.com/uploads/1/3/4/3/134374742/jevinefegavaf.pdfIn PDF document text
    • https://bugigubagide.weebly.com/uploads/1/3/4/5/134586777/buxabajutejujul.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/jadere/indian_breakfast_recipes_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af0f783-b597-4346-ae5f-247ce8ee5bc0/newumixodux.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/sovesivedapatusutelowasu.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/nora_roberts_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d129fbb-b81a-4d63-804b-84ba45c81897/togoribejifisevopa.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/tiberurugutimatojo.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/huy_nguyen-khoa_dpm.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_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 4992 bytes
SHA-256: 9518efb501d574cdbe57ed31f9d1fcdf1514170e42fbed4d35f3cb1d31415a3d
font_01_sfnt_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 10244 bytes
SHA-256: a0460c2b73cb8f8f9248385bbe69b589b6a1d7670549a764876233f3cd7cca9c

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