Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51ed893adf57b7c…

MALICIOUS

PDF

76.0 KB Created: 2020-11-20 14:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f1b4b5b2cdc458ebdb8c72b06967341d SHA-1: ca802ec0e17ca3c328f7afb6f63c6d06714160da SHA-256: c51ed893adf57b7c39cfde6dc951937bd6d91ed3c34304567dcaeb87029d5a38
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'trafffi.ru', suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to external, potentially harmful content.

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://trafffi.ru/123?utm_term=darts+cricket+rules+3+players PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5fa49bb63a88c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f8efa36e94ad.pdfIn PDF document text
    • https://vowimusu.weebly.com/uploads/1/3/4/6/134655535/suremuripimolif.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/bokexizometun/22872414602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03df806-c942-45a9-a8f7-7375e8b5cab0/sesexedimuvirakupeno.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/kedolipolal.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/classification_worksheet_matching_binomial_nomenclature.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/70985200993.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/dark_souls_best_dex_weapon_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b767c2-2d99-4446-af67-6214cc34cd36/pijudul.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/chamara_weerasinghe_all_album.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/4608191234.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/plano_7771_guide_series_pro_system_tackle_box.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/zojagofapadaj.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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 5256 bytes
SHA-256: 7c23fe199e93db90a10fe144571e70c4e77f9f6cbaee5607c92bc0a3a093f2b4
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 10600 bytes
SHA-256: 63345e8de43ec0dca8f3c90bb3468bee1b4e217e095de58f2ce9d54dd2f28859

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