Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bca56b99e9dcf1…

MALICIOUS

PDF

72.2 KB Created: 2020-11-18 15:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e845441ffb84ae9425a2aacc3f738b16 SHA-1: c470acfddc2c53a5dd571b145c56517ae4776819 SHA-256: d7bca56b99e9dcf1796bcf853da36e256bb0907f51174d83226616f54ed7b3ac
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/123?utm_term=king+of+thorns+plant In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_5f9bb7dc8d9ba.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/buwubiwupaxan-sewimezetud.pdfIn PDF document text
    • https://kifobanirijo.weebly.com/uploads/1/3/4/5/134595275/firab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f88d3e60daa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_5fad582acc2a9.pdfIn PDF document text
    • https://musazowoxagaw.weebly.com/uploads/1/3/4/3/134323980/xiwube.pdfIn PDF document text
    • https://fodibiwowi.weebly.com/uploads/1/3/4/4/134479135/73e9862bfa7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_5f9ff49e856b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_5f9f8e1f5757d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f9fcd5ee0072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412195/normal_5f9f7fc063f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8c11ba1f3f2.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/ae26aebb-b885-4844-ac61-3e6cc246d63e/77136139052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fcc462-85ba-4a20-b9c1-49317213b365/fedekuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae75e4e9-48d6-484d-95ac-11eb295c4304/96023277662.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_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 5132 bytes
SHA-256: f1463748e7fc3beebcb0a1d5bd63d7e69b8a3e7dbbffae9ddf1c1f7b97e75162
font_01_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 10572 bytes
SHA-256: c45bf1c6fc9a1d883c868627db5eb375b55b555a55e4a24d97e9457812e498e4

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