Malicious PDF — malware analysis report

Static analysis result for SHA-256 94af670929d476f2…

MALICIOUS

PDF

39.6 KB Created: 2020-06-04 06:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d67484918cbf889d612c927637e0b91 SHA-1: 8ccc601e49ff44c8081d7be8e0268978671f4fe5 SHA-256: 94af670929d476f2b9532ec6f4ca98aafc42589204efac6d1656f3fa5938f8e9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains some of these URLs, suggesting the primary purpose is to redirect users to a link farm, potentially for SEO manipulation or to serve further malicious payloads.

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 http://mx.melvintan.me/uploads/1/3/0/5/130540037/130540037.html#ecologia+da+informa%25C3%25A7%25C3%25A3o+davenport+pdf
    • http://msfranklinsjungle.com/uploads/1/3/0/6/130621114/7911083.pdf
    • http://howwastomorrow.com/uploads/1/3/0/6/130605325/3562662.pdf
    • http://crystalenergyprotects.com/uploads/1/3/0/2/130289154/9521d.pdf
    • http://carriewears.com/uploads/1/3/0/5/130551477/a0456.pdf
    • http://facebookbailbonds.com/uploads/1/3/0/7/130775440/baporugusilidos-sigovizoma-fepibujisa-devuwaf.pdf
    • http://nataliegmartin.com/uploads/1/3/0/2/130272877/relokevufidamuzibof.pdf
    • http://mtcomputerservices.com/uploads/1/3/0/8/130874082/9276410.pdf
    • http://mybasb.com/uploads/1/3/0/5/130551086/zusumexo_dugumom.pdf
    • http://webdisk.kamtectools.com/uploads/1/3/0/8/130874432/f1c906.pdf
    • http://two-rivers.net/uploads/1/3/1/0/131070488/7043224.pdf
    • http://mx.melvintan.me/uploads/1/3/0/5/130540037/terms.html
    • http://mx.melvintan.me/uploads/1/3/0/5/130540037/dmca.html
    • http://mx.melvintan.me/uploads/1/3/0/5/130540037/policy.html
    • https://dajowuzun.files.wordpress.com/2020/06/jamokibubalanixeb.pdf
    • https://bobozowino.files.wordpress.com/2020/06/11632295490.pdf
    • https://wimaped597797669.files.wordpress.com/2020/06/67404643122.pdf
    • https://xefosoxaxeni.files.wordpress.com/2020/06/jijexoxefatipo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067fd.bin
212d27350411395740687cb77eb63b033d3ba50ae930c3cb225d97fe3dfbd1e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FD 13460 bytes

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