Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4e7619d6997330…

MALICIOUS

PDF

43.7 KB Created: 2020-11-06 03:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2b3b1d0a75181c308a87f8001d0e2031 SHA-1: 12324928378c8f603aac6026bc0d87fafa7307e4 SHA-256: 6f4e7619d6997330adffa5258cbd83285eef05fb8b936009c67a8ca07f5dd9f5
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, also contains URLs that are likely intended to direct the user to malicious or deceptive content. The ML classifier strongly flagged this PDF as malicious, suggesting it is part of a link farm or SEO poisoning scheme to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/aws?keyword=choosing+the+right+word+unit+3+level+c PDF link annotation
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/loduluxadasivik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_5f97c3171eaf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f8b7a1e66d49.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/0d47913441.pdfIn PDF document text
    • https://vutizimowunofe.weebly.com/uploads/1/3/4/3/134354130/087c9f02b8de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f87b2a8cd081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5fa489b6f0267.pdfIn PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/povixodizimebokib.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/jewizopukuni/orange_roulette_2_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00626c57-cbe5-4c10-9452-1a5e4e1cd51f/fudotof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5155e8-9389-4e50-8d01-e161da1ea678/sony_str_de197_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/kotuleratinozizijutipa.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/rotapaxutugudubotiw.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_off00006b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B07 5212 bytes
SHA-256: 62ed6c506665bb4927ec2318eec692fc480f3a44297e75e0850a78c3088cf333
font_01_sfnt_off00007cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD4 10900 bytes
SHA-256: cb155362cf3e36df03277c2297e4a2d2d58828d271c73ab7dc4e1ece42ce9386

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