Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f51d44f1af8eb42…

MALICIOUS

PDF

43.5 KB Created: 2020-03-24 02:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 85811714d495c38de26e30092b42d83b SHA-1: 44032344bc2d380477e9beae9d918ca4eeda4d77 SHA-256: 0f51d44f1af8eb42ca376d0adfcb6b71d4146c472b545360a53f2e91a8acd736
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL points to an HTML page, while many others point to PDF files, suggesting a tactic to manipulate search engine results or distribute content. No scripts were extracted, but the nature of the embedded links indicates a malicious intent to redirect users to potentially harmful external resources.

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://penzugyijelentesek.com/uploads/1/3/0/7/130739628/130739628.html#art+and+fear+book+summary
    • http://livingpurewell.com/uploads/1/3/0/4/130488299/2183540.pdf
    • http://mexicofolk.net/uploads/1/3/0/6/130639471/sitada.pdf
    • http://www.colorworxllc.com/uploads/1/3/0/7/130776257/9adf5f327e63.pdf
    • http://www.musikdeltid.dk/uploads/1/3/0/3/130313468/4372176.pdf
    • http://thecastlerockroofers.com/uploads/1/3/0/2/130288710/ea398.pdf
    • http://cirruscompu.net/uploads/1/3/0/9/130969501/juvofuwefot.pdf
    • http://blazzt.com/uploads/1/3/0/4/130483961/7bde6ca8766.pdf
    • http://linuxpos.org/uploads/1/3/0/7/130776096/4780172.pdf
    • http://thelightrebel.com/uploads/1/3/0/7/130776326/2708440.pdf
    • http://cebport.org/uploads/1/3/0/8/130813604/novomamirisorowuka.pdf
    • http://masterrepairplumbing.org/uploads/1/3/0/5/130539305/gowiwelekigudi.pdf
    • http://marymooreconsulting.com/uploads/1/3/0/3/130379226/vebutetopafud.pdf
    • http://simplyinspiredwords.com/uploads/1/3/0/7/130739375/ruzamapi-jexanijati-tosazetogoban.pdf
    • http://drcmullen.com/uploads/1/3/0/4/130476395/7baee315a16acb4.pdf
    • http://kcsclubhouse.com/uploads/1/3/0/6/130604441/8154905.pdf
    • http://undyingswan.com/uploads/1/3/0/6/130604470/manugupete.pdf
    • http://www.psycha-funk.net/uploads/1/3/0/6/130621238/sesare_wikodota.pdf
    • http://bookthesport.com/uploads/1/3/0/3/130323455/d816943b.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_off00008013.bin
cd7d3994a7987e1383dcafbea27bea810ebc7c60cac2d3ad44d46b07c7d61348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8013 8588 bytes

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