Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7617fe272be2ad1…

MALICIOUS

PDF

36.6 KB Created: 2020-04-15 06:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a921a6364b7947df428fc645347a1e55 SHA-1: 1b9cd1b0e0f27cb7118adcdef9d8f19e9c14e39a SHA-256: b7617fe272be2ad162de1ed578c5232d099f83c99ebfcea97d87042891c61586
92 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to similarly structured URLs, indicating a link farm for SEO manipulation or phishing. One prominent link, 'http://myamazonuk.com/uploads/1/3/0/6/130604706/130604706.html#best+cbr+reader+apk', suggests a lure for downloading a fake reader application. The ML classifier strongly supports the malicious nature of this PDF.

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://myamazonuk.com/uploads/1/3/0/6/130604706/130604706.html#best+cbr+reader+apk
    • http://pelabarba.com/uploads/1/3/0/3/130323430/fukokipeku_puvujuzolitebeg_wilosevaw.pdf
    • http://jcindustrialservice.com/uploads/1/3/0/4/130478819/38d61e351f3.pdf
    • http://wildwonderfulyou.com/uploads/1/3/0/6/130639947/96e71ff90.pdf
    • http://1901ironworks.org/uploads/1/3/0/6/130639215/nozifesonijabaj.pdf
    • http://gandsescortservice.com/uploads/1/3/0/7/130775842/kukawisuxigogomos.pdf
    • http://adultaspect.org/uploads/1/3/0/5/130546937/samifa.pdf
    • http://dpjutzi.com/uploads/1/3/0/6/130640178/410836.pdf
    • http://an-zk.com/uploads/1/3/1/4/131406780/vofilokomukefi.pdf
    • http://arty-lab.com/uploads/1/3/1/0/131070920/515637.pdf
    • http://shadowslabyrinth.com/uploads/1/3/1/3/131379629/4f7b62ab.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_off0000673a.bin
c7fd0ea3518ddf622d2245b19c3eb02e3f24869a39d8d3f58774289152c72092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673A 8168 bytes

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