Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fede47faf85ddc…

MALICIOUS

PDF

37.3 KB Created: 2020-11-07 04:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a131cf163a57c8e862e5655772f49755 SHA-1: d1de6dfc7d9941478e605be4e50ae1bf2a181fec SHA-256: 58fede47faf85ddc0e9d6fe37a564067bef676e667cee651073a938ab9fd425b
126 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One URL, 'https://traffnew.ru/aws?keyword=hourglass+glued+to+the+table+song', is directly embedded in the document body. The ML classifier strongly flagged this PDF as malicious, suggesting it is designed to redirect users to potentially harmful content or facilitate further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://traffnew.ru/aws?keyword=hourglass+glued+to+the+table+song PDF link annotation
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/7250927.pdfIn PDF document text
    • https://wuzafonufiza.weebly.com/uploads/1/3/4/3/134341979/5904943.pdfIn PDF document text
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/fe4c86b.pdfIn PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/7dc264ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zetetojowu.files.wordpress.com/2020/11/change_management_models_comparison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ae5fea-fe0c-4c16-b59c-ab6b1d5a78ee/78241317379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0011e30-7243-410e-a071-5bca095208f9/logatexir.pdfIn PDF document text
    • https://gizibutabob.files.wordpress.com/2020/11/71533201839.pdfIn PDF document text
    • https://s3.amazonaws.com/tipakalif/kikumisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6da4eb-e30e-433d-a7de-548e561f7cc8/84377811868.pdfIn PDF document text
    • https://guzurelezusa.files.wordpress.com/2020/11/36376059917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ecdb22a-6836-420d-b14b-26b7d057fb7d/momixeremazupakovomo.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_off000054ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54CA 5188 bytes
SHA-256: 70ebec6a95517a29bc8b7583808b722caf0c944112ab608547255b5202140087
font_01_sfnt_off0000665f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665F 9980 bytes
SHA-256: 1244b8187b5d937e24309affcbcbd966d6e770660d1d225513f4c48b78b6dfb4

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