Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8beafb7bc59736…

MALICIOUS

PDF

61.3 KB Created: 2020-11-26 06:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a7594369629475dbb2745bb1ee19e6e8 SHA-1: 3408aee61f1a626eccd8f8c4d3592f8df267d404 SHA-256: 8c8beafb7bc597364f804d300087c71311f820e59e30bf3cc594ac4fac04d5a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a link farm with numerous external URLs suggests a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a potential delivery mechanism for further malicious content or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=croatia+travel+guide+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5f9da8374452b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450434/normal_5fb9de76b7e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_5faa8bf86e909.pdfIn PDF document text
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/ratawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495974/normal_5fb7e0b855a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_5fb55cf6f139f.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/nowokil/bunk_bed_assembly_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/compumedics_limited_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1182dd47-291a-4a3f-b599-5df27c4be5cb/nufubufakagawi.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/sijunumumejazo.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/lidularimedadiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f12ec69-7c8a-40ed-8553-047d20b70370/37964335818.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/best_riding_lawn_mower_2019_consumer_reports.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_off0000b441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB441 4980 bytes
SHA-256: 2704d7b7188383b5c17a37168233860b639e54791c1a2963651a2cee8f2ad3c2
font_01_sfnt_off0000c524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC524 10556 bytes
SHA-256: 31330833301981ebe69617cadb3cd02f0b6a9ab8de223b544da5396bfbd24d89

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