Malicious PDF — malware analysis report

Static analysis result for SHA-256 83338fc0d1f94f6e…

MALICIOUS

PDF

39.3 KB Created: 2020-03-28 12:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 978d02356542733a54da05e919c9761e SHA-1: b991508ebc77f179e0739b2acd391e6a2c50f224 SHA-256: 83338fc0d1f94f6e55eea0daf21fae03f41feb31471848056c97ded21b79a835
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as PDF files with numeric slugs, indicating a link farm for SEO manipulation or malware distribution. The document body, though heavily obfuscated, contains a URL that appears to be a lure for remote control codes. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://juliejesternewman.com/uploads/1/3/0/4/130483909/130483909.html#charter+remote+control+codes+for+insignia+tv
    • http://randomgraphix.co.nz/uploads/1/3/0/5/130588410/pulapenerev.pdf
    • http://whytescoffeehouse.com/uploads/1/3/0/2/130273616/73885618.pdf
    • http://simpleupscrm.com/uploads/1/3/0/5/130551339/jorob.pdf
    • http://webdisk.transbloke.com/uploads/1/3/0/5/130551298/sebinib-geligusosepavi-tifixofamozad.pdf
    • http://experienceflavour.com/uploads/1/3/0/7/130776123/924c14.pdf
    • http://cruzhometeam.com/uploads/1/3/0/6/130622009/jejisi.pdf
    • http://teamrodriguezrentals.com/uploads/1/3/0/5/130547689/mukolema-wibogupugeduw-rikovaxawaketo.pdf
    • http://mysunshinedistributors.com/uploads/1/3/0/5/130590205/pajikunobodi_kamot_diwapowij_zovimanowewud.pdf
    • http://ryanmittencreative.com.au/uploads/1/3/0/5/130551208/temaxu.pdf
    • http://mybestpoetry.com/uploads/1/3/0/2/130289652/2076965.pdf
    • http://www.dublinratrace.com/uploads/1/3/0/4/130476158/9143813.pdf
    • http://lindasstories.com/uploads/1/3/0/3/130323146/zesalidobamujosapow.pdf
    • http://gentledentist.nyc/uploads/1/3/0/2/130292143/6035155.pdf
    • http://www.setonsandsholidayhomes.com/uploads/1/3/0/6/130605517/8255785.pdf
    • http://anderson-missions.com/uploads/1/3/0/3/130323900/276411.pdf
    • http://pvatherapy.com/uploads/1/3/0/7/130776279/rovidenes.pdf
    • http://tranquilitybasellc.com/uploads/1/3/0/5/130588222/320266.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_off00007161.bin
6d941138cea095417f5c6d829dfc660fb01a23b523ce6e6d70d3a74148ff5645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7161 7856 bytes

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