Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1b0fb26ec87634…

MALICIOUS

PDF

33.8 KB Created: 2020-06-12 01:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c023ae51fe31a49e648a2fbb3a1124b SHA-1: 659a5a7fef13bc4c831dbfb7ac8c221d09719222 SHA-256: 7d1b0fb26ec8763477c74e7a5644b8be87ffc5586c9c3584a5008488487eeea8
62 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, a technique often used for SEO link farming or to direct users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a large number of external links generated in a SEO-like manner. The document body, though partially corrupted, contains text related to 'expanded form worksheets 4th grade' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The primary URLs point to domains that appear to be part of this link farm.

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://makeupbycamille.com/uploads/1/3/0/5/130544702/130544702.html#expanded+form+worksheets+4th+grade
    • http://mx.stampgeneral.com/uploads/1/3/0/6/130604771/8692020.pdf
    • http://zodiaccomics.com/uploads/1/3/0/6/130604111/5508242.pdf
    • http://steelstringsmusic.com/uploads/1/3/0/3/130323998/pisurer_somagumupox.pdf
    • http://gweltonandassociates.com/uploads/1/3/0/2/130270963/8626510.pdf
    • https://zunuxav.files.wordpress.com/2020/06/56196777286.pdf
    • https://gusugiji.files.wordpress.com/2020/06/54893688661.pdf
    • https://dokubonese.files.wordpress.com/2020/06/45922182798.pdf
    • https://simesodut.files.wordpress.com/2020/06/gebizofefi.pdf
    • https://xibupipoj.files.wordpress.com/2020/06/39834224467.pdf
    • https://dexugosaduj.files.wordpress.com/2020/06/furawadux.pdf
    • https://nimodinuti111298458.files.wordpress.com/2020/06/vewitojuxinaguva.pdf
    • https://lebavop.files.wordpress.com/2020/06/ginolojamixavev.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_off00005a88.bin
031b27655d18ab320fa7494155c0f9a203b297b0bd57da28531df0f80a3fb621		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A88 9744 bytes

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