Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc94abe078b0a9c…

MALICIOUS

PDF

70.2 KB Created: 2021-01-03 14:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 99e4f7a96f7550deb77e6e617e85719a SHA-1: 76831592018bcb21a1535a51332fd21391d33ed0 SHA-256: 3dc94abe078b0a9c94e68696ea662ab74d01bdadf202c7accf91e8f10ef50561
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm likely used for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=the+end+void+minecraft PDF link annotation
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/e1d7f747fc2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_5fa0cfd6d0b6b.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/09864a.pdfIn PDF document text
    • https://divakifemomo.weebly.com/uploads/1/3/5/3/135311574/4395913.pdfIn PDF document text
    • https://jeripakituwimug.weebly.com/uploads/1/3/2/6/132695489/kufadesiginefax.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/kojoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5f99ae1820753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5fcb773c5e112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5fabecdfab029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_5fa4edef9569f.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/vagibawupofo.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/gajakelegeza/matujela.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/gizimowekuxixisafileneg.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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 5060 bytes
SHA-256: 21851d7c6e52f95c18371ad8cf75c7a4e58aa788fa322125ab75f72e52a97551
font_01_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 10792 bytes
SHA-256: 68b1dcfd98125d8bd14c5fda1f95432758b2a541a87631985636c613477ad8a8

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