Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25bef0af58a9d40…

MALICIOUS

PDF

74.0 KB Created: 2020-12-25 02:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 661ddd0cbd8d5f8f4099624a647873e2 SHA-1: d1ec5341dc7557eed9109c9e18d65a4486d96b29 SHA-256: d25bef0af58a9d4053593b5abf95f7234ab15bff1ee730882de42c2a4af52583
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the embedded URLs, 'https://trafftec.ru/123?utm_term=critical+thinking+essay+topics', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=critical+thinking+essay+topics PDF link annotation
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/a911504c6c8a.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/3d2edc8.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/3878414e-cd9d-4500-bb56-b4ad63443d27/bonasupeluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7027be-3f8c-4094-9eaf-b90df53570e1/fishpond_waterdance_guide_pack_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/400a6cbe-2190-4edd-9fcf-850fb3141c53/leadership_theory_and_practice_8th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/pesquisa_em_educao_abordagens_qualitativas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3460cbe-46f1-46d7-9a18-df434dffda71/63978137237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5668583a-ed9d-487c-a17a-4aed3cb814fd/new_york_fashion_week_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f53c93-b48f-46f0-808b-e418a37f0bca/gavelatam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0427eb53-88bc-4607-b50b-8041f13771df/lenovo_g50_30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb2918b-4cab-4179-80c6-07f824d219f3/where_is_billy_fuccillo.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/77175714345.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/function_type_template_parameter_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74207eda-4ecb-4dc1-b519-33790a74557a/xuxoxisev.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_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 5264 bytes
SHA-256: be39fc0970be1d194823e7d452f18a43602b247a2bb9093921c90d78f5f49412
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 10820 bytes
SHA-256: 187030c7cd7d71da19641e1b85922967d50c6c479a9af69979880edc8b63d3f7

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