Malicious PDF — malware analysis report

Static analysis result for SHA-256 543fab62d6ecd8eb…

MALICIOUS

PDF

43.5 KB Created: 2020-04-07 21:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: efec940acb4259930541f2c4b8ae18b3 SHA-1: 3b6c97ead2bff9d8cda1b1954916f26d75b216d2 SHA-256: 543fab62d6ecd8eb57def21018b2a65ade51b67bf7bfd18135014b3088af98fc
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly suggests malicious intent. While no scripts were extracted, the PDF structure and numerous external links point towards a campaign designed to manipulate search engine results or distribute further malicious content.

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://testingoutasitebuilder.net/uploads/1/3/0/9/130969559/130969559.html#ablls+r+tracking+sheets
    • http://clippercityforge.com/uploads/1/3/0/4/130483285/5437451.pdf
    • http://sprinklersystemedmonds.com/uploads/1/3/0/7/130739871/768aba5f.pdf
    • http://wemakethedifference.net/uploads/1/3/0/3/130313057/3781526.pdf
    • http://bella-giardino.com/uploads/1/3/1/4/131453374/6999636.pdf
    • http://�bersport.de/uploads/1/3/0/7/130775953/saxizetonopabixesu.pdf
    • http://serenoaesthetics.net/uploads/1/3/0/6/130603683/fe656936aa8a1f1.pdf
    • http://mfcmasterframingcontruction.com/uploads/1/3/0/7/130738924/pubiw.pdf
    • http://top10medicalalerts.com/uploads/1/3/0/7/130739918/1390540.pdf
    • http://minerup.com/uploads/1/3/0/4/130476471/b752dc80cb093a.pdf
    • http://hawgridin.com/uploads/1/3/0/2/130291556/daca0d7df27911d.pdf
    • http://dccircular.com/uploads/1/3/0/4/130492963/1964031.pdf
    • http://victorvillefamilylaw.com/uploads/1/3/0/6/130621043/bumopokijinejajed.pdf
    • http://my-cjr.com/uploads/1/3/0/6/130604947/55c94ba010594.pdf
    • http://kiheivacationcondo.com/uploads/1/3/0/5/130551794/zinafibupi.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_off000080ee.bin
4b469bfe708d368bef0fdd86cff93c713f6c26b546e75ecae9f1356168046426		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80EE 8348 bytes

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