Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e9bd11282b371f…

MALICIOUS

PDF

45.3 KB Created: 2020-04-01 14:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d41e439f820078bf27d778fce23860f1 SHA-1: b28576ed80114d4cdee397b5cd06fd95700b4ec9 SHA-256: f0e9bd11282b371f934d62d75eb10e91d3701d4721edd017140873d3207bd607
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, many of which point to PDF files with numeric slugs, indicative of a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains text related to 'Chemistry chapter 4 test b answers' and references the authoring application, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious.

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://lisabrockcounseling.com/uploads/1/3/0/5/130544746/130544746.html#chemistry+chapter+4+test+b+answers
    • http://creativeconsultingsolutions.org/uploads/1/3/0/4/130476511/10b64c879.pdf
    • http://abingtonassociates.com/uploads/1/3/0/3/130379488/faval.pdf
    • http://loadngohirecom.com/uploads/1/3/0/6/130639418/tiwinekem-potekotoju-pozuvirar.pdf
    • http://alliedfoodforum.org/uploads/1/3/0/4/130483230/3737360.pdf
    • http://stlukesfw.org/uploads/1/3/0/4/130476054/d9ebd01318392.pdf
    • http://holidayandpalms.com/uploads/1/3/1/3/131382470/8622060.pdf
    • http://bnewsfrance.com/uploads/1/3/0/5/130589237/5975905.pdf
    • http://cpanel.scarboroughmaineyoga.com/uploads/1/3/1/3/131398264/4dbb6330f.pdf
    • http://cedillosair.com/uploads/1/3/0/6/130604395/7939638.pdf
    • http://redmoorstudios.com/uploads/1/3/1/4/131407406/javezer-refepo-linixupuzi.pdf
    • http://distribuidora.org/uploads/1/3/0/6/130639236/gajizuno.pdf
    • http://houserebuilder.com/uploads/1/3/0/2/130272377/3554655.pdf
    • http://jorajunction.com/uploads/1/3/1/3/131379525/3621533.pdf
    • http://hartsales.info/uploads/1/3/0/5/130589268/wasuzidut.pdf
    • http://joyspringsbyjudy.com/uploads/1/3/0/5/130543155/gewifejedulobej.pdf
    • http://rtatriaddevelopment.com/uploads/1/3/0/4/130436089/b82638c74.pdf
    • http://epiccollegeconsulting.com/uploads/1/3/0/9/130969283/5056047.pdf
    • http://namkoorbindustries.com/uploads/1/3/0/2/130271187/budedodarinidum_vadusepuxebi_modeza.pdf
    • http://milestoneco.net/uploads/1/3/0/6/130604324/ab2e3c08.pdf
    • http://canungraservicesclub.com.au/uploads/1/3/0/7/130776726/ximogufodatodukojibu.pdf
    • http://warnhamplan.com/uploads/1/3/0/8/130814513/674741.pdf
    • http://bastion.co.nz/uploads/1/3/0/9/130969776/meramago.pdf
    • http://nordicinternational.net/uploads/1/3/0/5/130588624/2663308.pdf
    • http://churchmouseprek.com/uploads/1/3/0/6/130620251/fatomojifi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007967.bin
b151e42744b20c3d1373366488d81dbe5c2c37f80a78a3c6a9876aaa037e3836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7967 8020 bytes
font_01_sfnt_off0000983f.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x983F 4144 bytes

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