Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c28243b3f7ac06…

MALICIOUS

PDF

65.6 KB Created: 2020-11-22 04:30:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f1901bbc5c4d03ae261ea4b50841ad61 SHA-1: b7837fca0e0b1c945f5fb99e33a5f41ecdbf3d76 SHA-256: 11c28243b3f7ac067d8d55aaca18d52e548f7c6fd90384b8ddbeaf8699b69cf1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://trafficel.ru/aws?utm_term=ardent+leisure+group+annual+report', is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing lure.

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
  • 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://trafficel.ru/aws?utm_term=ardent+leisure+group+annual+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391319/normal_5f8f1d028e1aa.pdfIn PDF document text
    • https://balogidito.weebly.com/uploads/1/3/4/7/134726556/4ebb77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f95d55f38b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f9571e75b321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f905cf244404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f89281944e25.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/3a367148-03a0-46c1-ad34-51d65402e8ef/fallout_4_university_point_settlement.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/advanced_computer_architecture_lecture_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d8b398-0c3e-4c78-9220-7c86ef1e0942/65721946331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bc9e13-6833-439d-9f70-864bf2b12ff4/5530990228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e8bcac5-1b0e-4f69-9503-a50e75af26ce/pupetibi.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_off0000c209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC209 5116 bytes
SHA-256: c27835ad6140397b113051976d5727eef58a0ce80a1de13771be78d4a7b0a785
font_01_sfnt_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 11308 bytes
SHA-256: 38a47105e60b6494b3daae67445f497c57d1042e6f4e7988aa0bbe92d43691f8

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