Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f579bd001088d66…

MALICIOUS

PDF

81.0 KB Created: 2020-11-25 00:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c2be72f10ff3ca9ab315085612f40e7e SHA-1: 1c89578704af10c7794fb77aac83cdb6936ba1c8 SHA-256: 4f579bd001088d6602c0528b3b16b10ac36d66e31ca12089d880f900dbf9f841
156 Risk Score

Malware Insights

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

This PDF document, disguised as an annual report, contains a large number of embedded external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive content and numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=sheng+siong+annual+report+2019 PDF link annotation
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/6429441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_5fa73627078ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5f9a5e4076068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_5fb60a47d7ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fbc0da1efb1b.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/9a62ad76-cadb-4f87-a5fb-9943cec297b8/serakutata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a04358-c4f6-480d-913b-d165f0f87ce7/toshiba_regza_26av733g_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2228930-27e8-453b-97ed-760f8c707abf/nizoxesuwiveda.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/annuity_insights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5999eed-5356-4548-a87e-ad2574556b93/38333555923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad41d883-487d-47bd-8fbb-403b7b87b429/que_es_geometria_plana_o_euclidiana.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_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 5664 bytes
SHA-256: 6185b11ef5ae294f8bda187bc13ff28fd5d0ed5855d0749ff29952e5afab8505
font_01_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 11504 bytes
SHA-256: 6255fd352e698e30cab06f535e819f6d47d28e623bf4a21ad59277df235db6b9

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