Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4f14712c642cf7…

MALICIOUS

PDF

35.6 KB Created: 2020-06-04 21:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 541ac81015191124d5742a2e0ada05a4 SHA-1: 11cecdd7bad57ba497476866a03fb878fc3edabf SHA-256: 0f4f14712c642cf7c2a1d5cc1775a1597098338ab2cb60349385bb43834db1ac
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise, pointing to potentially malicious or deceptive content hosted on various domains.

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://cc-recovery.com/uploads/1/3/0/7/130739021/130739021.html#descargar+musica+ranchera+mexicana+g
    • http://hostmaster.naeye.org/uploads/1/3/0/5/130590373/dupavidav.pdf
    • http://i-wills.net/uploads/1/3/1/3/131380725/2489231.pdf
    • http://cypressenergyservices.com/uploads/1/3/1/3/131397983/dexib-xejenakumubev.pdf
    • http://carollerner.com/uploads/1/3/1/1/131163563/pesejepogejodenal.pdf
    • http://hostmaster.travrocks.com/uploads/1/3/0/6/130620646/fosotimum_jowulig_masebuzusoz_ganerirudero.pdf
    • http://woonsocketschools.org/uploads/1/3/0/5/130539940/a636b8a.pdf
    • http://alwayssummer-time.com/uploads/1/3/0/5/130546415/bawezum.pdf
    • http://grandviewmemorialpark.com/uploads/1/3/0/6/130604838/sifagoz.pdf
    • http://cc-recovery.com/uploads/1/3/0/7/130739021/terms.html
    • http://cc-recovery.com/uploads/1/3/0/7/130739021/dmca.html
    • http://cc-recovery.com/uploads/1/3/0/7/130739021/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dizosolon.files.wordpress.com/2020/06/31618918104.pdf
    • https://dugazide.files.wordpress.com/2020/06/vidufidosifasotonos.pdf
    • https://dakisil.files.wordpress.com/2020/06/pepejofarodavumatoti.pdf
    • https://seteletunifa.files.wordpress.com/2020/06/gotizapuvarigeradab.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059f1.bin
b609ab28493e8345a10a98fa24bf2621ec17e726de34b6284ac807fde9593534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F1 12488 bytes

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