Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c0931f198c8d19…

MALICIOUS

PDF

40.9 KB Created: 2020-03-08 10:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 113483c6ec0e7e2bf73394c9d02e1d58 SHA-1: 7ce1a3752b011eba8008f3cc9397974bb6e9e489 SHA-256: a3c0931f198c8d19d764521667c66729f9b6c2afd3e44b1240830036a0b78a15
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, potentially used to distribute malicious content or manipulate search engine rankings. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, limiting the analysis of direct payload execution.

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://stephaniesolutions.net/uploads/1/3/0/2/130273801/130273801.html#reading+comprehension+sample+questions+gmat
    • http://somethingsithoughtatthetime.com/uploads/1/3/0/6/130639221/5c684b.pdf
    • http://winstonsalemkids.com/uploads/1/3/0/6/130605253/nuxav-purole-mufugatutigex.pdf
    • http://mommysandminis.com/uploads/1/3/0/5/130540065/norelarukudewete.pdf
    • http://rannistan.com/uploads/1/3/0/2/130271229/vemuvenin_nepiwu_soduxoseg_vuliduvufide.pdf
    • http://www.luxluxe.shop/uploads/1/3/0/4/130436306/zeruponukepeb-nojupo-zorezitekiforit.pdf
    • http://canaiandchai.com/uploads/1/3/0/7/130740192/nutefidijawaponem.pdf
    • http://victornechoalmeida.com/uploads/1/3/0/3/130379549/7305432.pdf
    • http://jayvincimusic.com/uploads/1/3/0/3/130313105/tubomevamobukafareto.pdf
    • http://www.toncanadachairs.com/uploads/1/3/0/5/130542853/dojikep.pdf
    • http://nwdogretreat.com/uploads/1/3/0/6/130622042/516e8464939d7.pdf
    • http://upholsterysewingmachine.net/uploads/1/3/0/8/130814193/a7c4611a3cef095.pdf
    • http://lexanimi.com/uploads/1/3/0/6/130604324/3132474.pdf
    • http://rockymountainresponse.com/uploads/1/3/0/6/130620677/gomesabovumun.pdf
    • http://mrskramlsclass.com/uploads/1/3/0/4/130476976/sokovusebuse.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_off0000774d.bin
fb7c8492622c8dc91262515f8246e7bec6f0b7ad21b9f65e68f9dadc8397bdb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774D 7936 bytes

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