Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f07c9881572738…

MALICIOUS

PDF

40.2 KB Created: 2020-03-11 09:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 359e2eca9005b1d8d79113b3dcb4b5c6 SHA-1: 70e6e4e94ad17426fa6dcb16ca3e9fbd0ebe55ee SHA-256: 85f07c9881572738c5a12809a36cef8b28750499f604001eb69288a7a1ebba7a
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains a URL that appears to be a lure for users interested in health information. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to potentially harmful content or phishing sites.

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://xiaoyouqipaixiazai.br3h.com/uploads/1/3/0/7/130775821/130775821.html#hiatal+hernia+relief+without+surgery
    • http://cantonfair2u.com/uploads/1/3/0/7/130739298/dajobodapewibupod.pdf
    • http://www.jonosthots.com/uploads/1/3/0/6/130604765/f10a8c4a3a19.pdf
    • http://www.sixtarubio.com/uploads/1/3/0/7/130738646/f414da60b.pdf
    • http://dealnowauto.com/uploads/1/3/0/5/130544790/kilamakowerunot.pdf
    • http://dessante.com/uploads/1/3/0/7/130775012/kefix.pdf
    • http://keepcsamaphysiciansociety.com/uploads/1/3/0/6/130604358/fudajovapiz.pdf
    • http://mta-sts.mx.ignitesq.com/uploads/1/3/0/8/130874570/d8169e20.pdf
    • http://ministryvillagega.org/uploads/1/3/0/3/130313410/65c09ad15ce1884.pdf
    • http://www.turtlecoastbraceletcompany.com/uploads/1/3/0/5/130540021/add22923c3869a8.pdf
    • http://dirkhasslehoff.com/uploads/1/3/0/2/130289702/0b06a979ec4.pdf
    • http://garagedoorrepairsantafesprings-ca.com/uploads/1/3/0/5/130588263/4491175.pdf
    • http://plainenglishfordoctors.com/uploads/1/3/0/6/130621215/d1e9a285898392.pdf
    • http://www.elearningprose.com/uploads/1/3/0/7/130739479/c6731450d7.pdf
    • http://kandlcast.com/uploads/1/3/0/7/130775219/debotazaw.pdf
    • http://nickysawesomewebsite.com/uploads/1/3/0/6/130604098/gegetifokemo.pdf
    • http://www.jag-va-services.com/uploads/1/3/0/6/130605115/radopadoxiwagotas.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_off000074e5.bin
6e8d01356ddf445e47115f7d9bad33f9651c7c8418b21c96ee486a73137357dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E5 7912 bytes

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