Malicious PDF — malware analysis report

Static analysis result for SHA-256 29483ac9ac7c644f…

MALICIOUS

PDF

39.5 KB Created: 2020-04-04 09:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e34b2c9a3d804b8b84bc0798ed3be98d SHA-1: 2b6716c4588ca57f8ff3a603adad032a66b5941e SHA-256: 29483ac9ac7c644f4d70b50f44f0a044a61996069ca92324648eff314cf3f511
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs suggest a link farm or SEO poisoning tactic, likely intended to drive traffic to malicious sites or distribute further malware. No scripts were extracted, but the structure and heuristics strongly indicate a malicious dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9246421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9246421-0
  • 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://avazquezglobal.com/uploads/1/3/1/4/131455663/131455663.html#10+oraciones+con+verbos+regulares+en+presente+simple
    • http://dyinginamericafilm.com/uploads/1/3/1/4/131437299/1507719.pdf
    • http://americasbesthomeinspectors.com/uploads/1/3/0/5/130551728/xagowaveme.pdf
    • http://stcatherineithaca.org/uploads/1/3/0/7/130775085/e7e1a52598.pdf
    • http://ginaalther.com/uploads/1/3/0/9/130968917/5221175.pdf
    • http://parkour-jerusalem.com/uploads/1/3/0/5/130588616/kujujuk-fubarolevodal-mavelibi.pdf
    • http://selfloveinplainsight.com/uploads/1/3/1/4/131406013/4328939.pdf
    • http://agguidanceconsulting.com/uploads/1/3/0/7/130739835/4e90730d24.pdf
    • http://forwardfitness.net/uploads/1/3/0/5/130590618/7f7342c.pdf
    • http://whatdidshemean.com/uploads/1/3/0/5/130588966/betemupawa.pdf
    • http://avantedesigngroup.com/uploads/1/3/0/6/130621755/nosita.pdf
    • http://carolinaeast.ca/uploads/1/3/0/4/130436222/gufeleruso.pdf
    • http://cellupica.ca/uploads/1/3/1/3/131378972/pijugujikefulus.pdf
    • http://mail.psygnyc.com/uploads/1/3/0/7/130740387/586477.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_off00006eea.bin
2878c3c01e23403ffb280f4384574337ae15524f436762c29238b5d9e9adf05f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEA 8668 bytes

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