Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d8fb2267b37831…

MALICIOUS

PDF

52.7 KB Created: 2020-11-08 13:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 54e65d6926388cf97671dc95f02c1492 SHA-1: 3dbed73f2f5cee355caef9b03c1bc2a5f7a1a672 SHA-256: 79d8fb2267b37831b5cfd0e66c72a9bc1efc58555dc62c190fd9e52779b59d72
66 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a domain known for malicious activity, disguised with keywords likely intended to attract victims. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to host external links, potentially for phishing or malware delivery. No scripts were extracted, but the presence of the malicious URL is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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?keyword=southside+high+school+alabama+1975 PDF link annotation
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/2776996.pdfIn PDF document text
    • https://wivixilor.weebly.com/uploads/1/3/4/3/134371520/3927143.pdfIn PDF document text
    • https://gowiwoniba.weebly.com/uploads/1/3/1/8/131857243/zelakejokalunemux.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/bazumabiragozuw.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/980179d9-00b4-4b0f-ba6d-9ded6912797d/pilgrim_s_chicken_breast_tenderloins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d3a4e8-fe36-4514-8979-41643c6c14cd/34669453693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22013048-81cc-4f79-8815-47d2d57521b7/baby_brezza_european_formula_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149a093d-53e3-470e-aaa5-6f6db796e311/jerarquia_de_operaciones.pdfIn PDF document text
    • https://puzonug.files.wordpress.com/2020/11/74809062935.pdfIn PDF document text
    • https://sefenubif.files.wordpress.com/2020/11/33231658938.pdfIn PDF document text
    • https://kaxemibewur.files.wordpress.com/2020/11/menivepupudowor.pdfIn PDF document text
    • https://nimiforaxub.files.wordpress.com/2020/11/somekamovixefubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16bd1ad-3ddb-49f1-bcbd-3408e01ba114/rorumuvebajado.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_off00008c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4B 5912 bytes
SHA-256: 41784e233cac1040480469c3e2189db0b50fc6261d6fce44b8d2404557157e49
font_01_sfnt_off0000a059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA059 11204 bytes
SHA-256: 9aaa1a728987fd5f006ec7f3a75c053222daae804a133d700c5db495b5faadb5

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