Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e46b7b332cdc984…

MALICIOUS

PDF

32.5 KB Created: 2020-04-30 08:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1b91bf9daea34f6d65b9a2d6cd19a1b SHA-1: 5a9cbc83c6a4f59b5889272be9b9275cba236a85 SHA-256: 6e46b7b332cdc984abcc95dbda2db9edfbd7d10ddf5e8350585ddb3b9187aff5
96 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 as a link farm, pointing to various PDF files on different domains. This technique is often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to duplicate object bodies.

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://swindonotpartnershipofchurches.org/uploads/1/3/0/2/130272350/130272350.html#doubling+and+halving+multiplication+strategy+worksheets
    • http://helgajoseps.com/uploads/1/3/0/5/130544089/lurixufafizu.pdf
    • http://eanesbond.biz/uploads/1/3/0/7/130775868/puleguje-natafenu.pdf
    • http://mikeshomepage.net/uploads/1/3/0/4/130478057/vidugazonitatabiliw.pdf
    • http://fjella.org/uploads/1/3/0/2/130291555/a515b1aa.pdf
    • http://usakungfu.com/uploads/1/3/0/3/130323934/xigimolozewe-xazudugepafimog-wuguxurinomupi-rejaliroribif.pdf
    • http://johannabauhus.com/uploads/1/3/0/5/130590312/a445a8061f.pdf
    • http://davidhurleyfilms.com/uploads/1/3/0/7/130738568/339c82114e1dd.pdf
    • http://wwwnitwitstudio.com/uploads/1/3/0/4/130435746/4fc74.pdf
    • http://finepointwedding.com/uploads/1/3/0/3/130379681/jibuwuw_lewuz.pdf
    • http://eastgateinstitute.com/uploads/1/3/0/4/130435945/nufine.pdf
    • http://mandmikala.com/uploads/1/3/0/4/130483294/begunimowa_rujesateba.pdf
    • http://whaletaletheatre.org/uploads/1/3/0/8/130813496/99819559c0e.pdf
    • http://sephrassweetdesserts.com/uploads/1/3/0/8/130814993/fezuzidejudolesejir.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_off00005589.bin
af7a6df7492833388caeff11b2d59ba148584a384f81097aea64932d77b0c0df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5589 7712 bytes

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