Malicious PDF — malware analysis report

Static analysis result for SHA-256 85008d21d4f2f978…

MALICIOUS

PDF

36.5 KB Created: 2020-05-17 09:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1991249ae872cae191cd9d151c4f3964 SHA-1: 83c42fe239171e83797e18815838e6c9636972e5 SHA-256: 85008d21d4f2f9785d66beff08158607a2b45024cefe2b4ed6016ac4c9b36f00
94 Risk Score

Malware Insights

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

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. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or distribution network for potentially malicious content, rather than a direct payload within this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://646635600607468430.com/uploads/1/3/0/2/130289476/130289476.html#jquery+animate+rotate+transform
    • http://ctksebastian.org/uploads/1/3/1/4/131437977/busid_jozub.pdf
    • http://unishapes.net/uploads/1/3/0/2/130272290/5599824.pdf
    • http://digitalpedia.ca/uploads/1/3/0/7/130775055/d038c.pdf
    • http://rootcausestl.org/uploads/1/3/0/6/130605253/lizevipowef.pdf
    • http://staticmixervalve.com/uploads/1/3/0/7/130738846/fexawuriwimo.pdf
    • http://downballottexas.com/uploads/1/3/0/6/130639105/f6edcda2accd8.pdf
    • http://dairycareaction.org/uploads/1/3/0/2/130289561/ca500.pdf
    • http://goodbasket.net/uploads/1/3/0/6/130621503/nitosutin.pdf
    • http://puppyloveplaydays.com/uploads/1/3/0/6/130620194/3790266.pdf
    • http://mosthi.org/uploads/1/3/0/4/130488091/5526073.pdf
    • http://spiessbuilding.com/uploads/1/3/0/6/130605374/ziduzu.pdf
    • http://mycandleboutique.com/uploads/1/3/0/3/130323542/e28c5.pdf
    • http://taylorleefit.net/uploads/1/3/1/4/131453041/3452160.pdf
    • http://ressourcegenesis.ca/uploads/1/3/0/6/130620453/jafabobu.pdf
    • http://legendsofthestage.net/uploads/1/3/0/5/130589241/waribolaxorekazew.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_off00005ed3.bin
c9fa76822922e6e8840f45a1cd1f1990eb30400ef6d73525e3d764a18f3f45ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED3 11804 bytes

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