Malicious PDF — malware analysis report

Static analysis result for SHA-256 defb91e5ef8b0f44…

MALICIOUS

PDF

42.3 KB Created: 2020-04-07 06:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2eb9e15f967f6115341508df3a160fe5 SHA-1: 6ff57f29dbe8d6c276faa73ae5a45354aba3eea8 SHA-256: defb91e5ef8b0f441cb2d2c939fc944b4e6932e46b795fca9b536b96484c82f1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to literary figures and rhetorical devices, which may be a lure to disguise the malicious intent of linking to numerous external resources. No scripts were extracted from this sample.

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://unicoiwinetrail.com/uploads/1/3/0/9/130969989/130969989.html#figuras+literarias+o+retoricas+definicion+y+ejemplos
    • http://keira-ann.com/uploads/1/3/0/7/130776083/falitupezuzenegere.pdf
    • http://lrn4evr-build.com/uploads/1/3/0/2/130270742/tavedox.pdf
    • http://healingheadcovers.com/uploads/1/3/0/5/130588779/1503817.pdf
    • http://maislimpeza.com/uploads/1/3/0/6/130620176/8237e076a9c.pdf
    • http://kkstechtips.com/uploads/1/3/0/7/130738511/491710.pdf
    • http://ecargclothing.com/uploads/1/3/0/2/130271047/1839974.pdf
    • http://sageandjackal.com/uploads/1/3/1/4/131453130/ae839.pdf
    • http://germany2connect.com/uploads/1/3/0/3/130379141/lofaxekopejedatemag.pdf
    • http://topofillinois.org/uploads/1/3/0/2/130274370/patuberesuw.pdf
    • http://pianomethod.info/uploads/1/3/0/5/130588246/fomiliwiroron.pdf
    • http://findfishingtourneyz.com/uploads/1/3/0/4/130489567/sijagowotaxoxut.pdf
    • http://southernillinoisvacationrentals.com/uploads/1/3/0/5/130540359/866860.pdf
    • http://reikienergyexchange.com/uploads/1/3/1/4/131453574/mararorevodo_muranobexib.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_off00007920.bin
d07c61ed38822d5e8825f91406b3c9e963031b1887dc05d69db6040fb5b72057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7920 9144 bytes

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