Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e1a0b9561080d9…

MALICIOUS

PDF

36.6 KB Created: 2020-04-04 13:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3a17e53c2ba5b8d70bc097171c794248 SHA-1: 247542596e3c9112da81e458ee1703a21c691110 SHA-256: 83e1a0b9561080d9e403ff386a402a85294f03618e72dbbcd32424fef5c145f4
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. This suggests a link farm or distribution network designed to manipulate search engine results or spread malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://theologyforbabies.com/uploads/1/3/1/3/131380589/131380589.html#segundo+premolar+inferior+derecho+permanente
    • http://hostmaster.pmawm.com/uploads/1/3/0/3/130324385/rujisede.pdf
    • http://stevemarshallarts.com/uploads/1/3/0/4/130483542/dapugu.pdf
    • http://educationaufoyer.com/uploads/1/3/0/7/130775436/8141951.pdf
    • http://taysangels.com/uploads/1/3/0/8/130813528/408566.pdf
    • http://melisaangulo.com/uploads/1/3/0/7/130738512/36eca.pdf
    • http://fetserviceservicos.com/uploads/1/3/0/8/130874163/wotopuxo-jixakisumibi-nemidozelani-nepusi.pdf
    • http://lotusfamilycommunitysynergy.org/uploads/1/3/0/6/130603847/kozilufafi.pdf
    • http://jayden-rose-leon.com/uploads/1/3/1/4/131437005/lomexosolorabika.pdf
    • http://coalhillcarpentry.com/uploads/1/3/0/6/130620195/wozimerazunajewa.pdf
    • http://jesseisilvaphotography.com/uploads/1/3/0/5/130551257/nuvesapavase.pdf
    • http://racheldaniellebeauty.com/uploads/1/3/0/7/130739034/pijevukixo-kebuwuzisarik-bupojik-lodiraxilarid.pdf
    • http://vampirefaceliftireland.com/uploads/1/3/0/3/130324170/2648b3d.pdf
    • http://acrosstides.com/uploads/1/3/0/7/130739742/f147f26661f.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_off000065cd.bin
a0fb6c2fca9bde2c4231be2c3dadc6ba5b37756c19be938284a605ea94cde8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CD 8236 bytes

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