Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfa2800b6d6dd6f…

MALICIOUS

PDF

34.1 KB Created: 2020-05-16 21:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff81d6c40ce5cc928a776ac5d9991f22 SHA-1: b3fdcdd16bb16095cbaf9a064ce442ee4acbb346 SHA-256: ecfa2800b6d6dd6f82451efa42acb486d2e6aab34d18db525a5e3e9352c49b04
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious activity appears to be the mass distribution of external links.

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://shopstrangilrz.com/uploads/1/3/1/1/131164358/131164358.html#klasifikasi+adiantum+trapeziforme
    • http://utuppercervical.org/uploads/1/3/0/5/130546717/5586484.pdf
    • http://snkgng.com/uploads/1/3/0/6/130639662/marurimapu-zivigufakivo-jadalorobumad-fewafereja.pdf
    • http://filohomemadegreekcakes.com/uploads/1/3/1/6/131606234/ed84018cd4.pdf
    • http://successfulbusinessstrategies.com/uploads/1/3/0/6/130640044/miwafasu-vobozukodefisek-fafiwagokas.pdf
    • http://vamutiny.org/uploads/1/3/1/4/131438211/jaluvedew.pdf
    • http://gioacchinonunziata.com/uploads/1/3/0/5/130589103/wakinupuz.pdf
    • http://robbackhouse.com/uploads/1/3/0/6/130604289/5812570.pdf
    • http://csge.eu/uploads/1/3/0/6/130639910/7808189.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_off000059ce.bin
c4db34d4c9a17351d4b37bba809c7728d7aaeb8820ef08b5b15ee82999035d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59CE 10492 bytes

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