Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf714780d54140d…

MALICIOUS

PDF

57.3 KB Created: 2020-11-20 07:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 113dfe63fd44814719c26838847b296e SHA-1: dab7916aabfd875e8539ea7612de4674a99bfb1c SHA-256: 4cf714780d54140d614534d129d86c99e0f2ea91987a759b29454d30d879d24a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other cloud storage services, suggesting a link farm or distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern.

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://trafffe.ru/aws?utm_term=house+of+fraser+men%2527+s+formal+shoes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f89887be2dd1.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/7e658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5f9930bec3bb4.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/xumakomowi/rabixe.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/kotelopanexilaxapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3cae14d-773a-4fae-b74a-f7dbc684024a/wiwojiwotimudixobe.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/dogafifemegonafovel.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/52609393062.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/psychsim_5_iconic_memory_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60802f97-f245-4352-aa74-af83f07576f9/zajidiguzuwesajedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651dcfdf-d782-4c22-8150-85dcfe441f34/fudam.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_off0000a7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F8 5004 bytes
SHA-256: dd0a4cb89929c848469b5ebf224f64bbcf9bc13b8d67a40fdc5107e62d94d5a2
font_01_sfnt_off0000b8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CB 9380 bytes
SHA-256: 4247bd44e753e5c2c17d7cc0d28855ab670d4b76e5f666d7b888d5f50a90b4d2

Open this report in the interactive analyzer, or submit your own file for analysis.