Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e71feb56ef24b9…

MALICIOUS

PDF

37.4 KB Created: 2020-04-02 10:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d685d814c07e15e12a5faa03abd5402e SHA-1: 986c5fdd96664def82b929923ba2d772c0b99384 SHA-256: a9e71feb56ef24b9f892aa4ff6cf9ed1b2a5903f8340479c7233623cc708fab4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains one of these URLs, suggesting the primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content via the linked PDFs.

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://floridianspac.com/uploads/1/3/0/7/130739578/130739578.html#que+tipo+de+corriente+electrica+usan+en+argentina
    • http://4thgencustoms.com/uploads/1/3/1/1/131164418/0d9926.pdf
    • http://digiwigit.com/uploads/1/3/1/1/131163761/kiretejusa_vuvujetufafisev_ximipivovidoj_baforibof.pdf
    • http://vintageautoma.com/uploads/1/3/0/7/130740504/4567897.pdf
    • http://panachepaper.com/uploads/1/3/0/4/130488294/duwagiz.pdf
    • http://dogcreekrotties.com/uploads/1/3/0/6/130620776/kotivipodi.pdf
    • http://mikeandpreet.com/uploads/1/3/0/5/130588457/393fa794c.pdf
    • http://streetlevelart.com/uploads/1/3/1/3/131383916/3852701.pdf
    • http://ok4kids.org/uploads/1/3/0/7/130738821/muzugufagopuk_kusoxebox_bagakez_lafozujomorir.pdf
    • http://www.viva-la-musica.be/uploads/1/3/0/7/130775471/dadin_gobono_jesekex_fipiz.pdf
    • http://christjesusordainedministries.org/uploads/1/3/0/6/130621413/a1e222.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_off00006718.bin
c56124dff2506db82a22178b1ffe40c62e139a928f9f510d611fd0093ca26967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6718 8736 bytes

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