Malicious PDF — malware analysis report

Static analysis result for SHA-256 62be8fbe3bef6ef5…

MALICIOUS

PDF

33.1 KB Created: 2020-11-06 16:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b9bc8aef8c57b2c9ffcd7770a80c7ce9 SHA-1: d1b3997d66d66a102a2671c78b56cd5e17f82aa3 SHA-256: 62be8fbe3bef6ef58be33d91d50f7dc3943d0d3944f988b784250a5d24985175
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-related content farms. The ML classifier also flagged this PDF as malicious with high confidence. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the structure and link farm indicate a malicious intent.

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/strik?keyword=emanuel+county+institute PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462992/normal_5fa4d928ecc93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f8e94dd66d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f88aca38eb41.pdfIn PDF document text
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/xenibuvabijupefotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5f97220b06dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_5f9b220b40e51.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/mipesen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_5f8c0aa0b451c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_5fa08c16906a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_5f8df7ecabb21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f99b3dd76b07.pdfIn PDF document text
    • http://emanuel2.eci.schooldesk.net/AlleIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loneminovu/samsung_rf28hmedbww_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mazugezijap/85219863246.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/bbe_sonic_maximizer_482i.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/tawakoxomuxev.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/wudizomaforuri.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/geforce_now_login_failed.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_off00004490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4490 4908 bytes
SHA-256: fbed5920d0291c0ca09deabbacf7e49c3def686900bb3ed59cc6d5c8be790f0e
font_01_sfnt_off0000553a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x553A 9852 bytes
SHA-256: 2338e1481b250ac8b84ffd89dea05e6df6c773c776dbff25885e5c496c34f382

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