Malicious PDF — malware analysis report

Static analysis result for SHA-256 79834798e2d70657…

MALICIOUS

PDF

35.7 KB Created: 2020-04-10 00:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fc887d3f7121a255f2548a65dff4e656 SHA-1: 1570ad17a6f81a945723751f6a9631d558257e02 SHA-256: 79834798e2d706576d3e4e6034905821efd372653d5814f483d24ea6a340afde
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a campaign distributing malicious content or performing SEO spam.

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://ngmsptsa.com/uploads/1/3/0/2/130270993/130270993.html#the+great+kapok+tree+reading+level
    • http://bignurm.com/uploads/1/3/0/6/130620402/titubibozadufixufilu.pdf
    • http://calledefelice.com/uploads/1/3/0/2/130289291/7a819c381.pdf
    • http://laurencoletta.org/uploads/1/3/0/7/130738553/a57962d26e7.pdf
    • http://phytoscape.com/uploads/1/3/0/6/130621772/fupagogitu-zafegubog-dorini.pdf
    • http://branduconsulting.com/uploads/1/3/0/3/130379589/gebegedosujubuma.pdf
    • http://dominio3d.com/uploads/1/3/1/3/131378774/xutaf.pdf
    • http://idealfermeture.com/uploads/1/3/0/9/130969090/mezowubanodeka-notegod-xutatu.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_off00006528.bin
c3c481bd1f922c9fca04ed0e683d8450508d633e243cff33df67b5cd1cdf4c38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 7428 bytes

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