Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f842a92156a452…

MALICIOUS

PDF

36.8 KB Created: 2020-04-16 12:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 04cb839836f1f94d948e4df30605c221 SHA-1: 5e7a46527bd63f538485cf9ef436cfa1e5f5d3c0 SHA-256: e2f842a92156a452659392d1c2c5c034f0b0cf63206dceb5dc97f0843097158a
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body text, though heavily obfuscated, contains a reference to 'Android graphics programming pdf' and the wkhtmltopdf tool, suggesting a lure to a fake document or resource. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to manipulate search engine results, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://christinabeautyparlour.com/uploads/1/3/0/7/130775465/130775465.html#android+graphics+programming+pdf
    • http://worldclasssurfing.com/uploads/1/3/1/0/131070645/623962.pdf
    • http://smartchoicetaxservice.net/uploads/1/3/1/4/131407424/topurofifixosizerog.pdf
    • http://sacredhearth.org/uploads/1/3/0/9/130969076/gudakolixoxov.pdf
    • http://ludwigentertainment.com/uploads/1/3/0/5/130545096/wiwafekomu.pdf
    • http://fitetimeapp.com/uploads/1/3/0/3/130379182/ce238df19b20be2.pdf
    • http://biocentrist.com/uploads/1/3/0/6/130620976/sadamozidezo_piwijizobeki_zugejanudama.pdf
    • http://sdlgcg.com/uploads/1/3/0/7/130740292/xuvexezabasuwitu.pdf
    • http://tonyshillitoe.org/uploads/1/3/1/3/131382118/7773828.pdf
    • http://msptohumboldtproducts.com/uploads/1/3/0/6/130639493/3142316.pdf
    • http://transitainer.biz/uploads/1/3/0/6/130639242/situnop.pdf
    • http://proesportscareers.com/uploads/1/3/0/3/130313368/binebe.pdf
    • http://householdgenius.com/uploads/1/3/0/4/130483167/af7b485b.pdf
    • http://smartchoice
    • 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_off000066c4.bin
42e3859eef65c130681409ca060ababd0e1b164d7cf903216e0d00d2a9c46f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C4 8432 bytes

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