Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c79651a88d159c6…

MALICIOUS

PDF

49.8 KB Created: 2020-04-14 09:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 705faed88ae0f513c8db6e72d21a13a7 SHA-1: 2c2fb38a1fcb31b6a9dbcd45dcf893408b8242f1 SHA-256: 1c79651a88d159c669c6aa172e1e2a7d1b990518e204a26c79202b2d856f3b6b
62 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, a technique often used for SEO manipulation or to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, pointing to multiple domains like 'docruby.me' and 'republicamultimedia.org'. No scripts were extracted, and the document body is largely unreadable, limiting further analysis of the specific lure. The primary attack pattern observed is the creation of a link farm to redirect users.

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://republicamultimedia.org/uploads/1/3/0/8/130813899/130813899.html#equivalent+resistance+problems+and+solutions+pdf
    • http://docruby.me/uploads/1/3/0/6/130640040/jawazomazalated-zovesene-tilog.pdf
    • http://wall2wallorganizing.com/uploads/1/3/1/3/131379409/cb3a0.pdf
    • http://growinvestmentgroup.com/uploads/1/3/0/2/130289690/470c7915a93.pdf
    • http://laplatagardenclub.org/uploads/1/3/0/3/130312961/ea3d628264e.pdf
    • http://tasheabaskets.com/uploads/1/3/0/7/130775134/zukob_wataritolim_lakipezunomet.pdf
    • http://grahamrighttravel.com/uploads/1/3/1/4/131407901/8acb0482a0f.pdf
    • http://toancaps.com/uploads/1/3/0/6/130621488/9564937.pdf
    • http://beautifulstrugglelove.com/uploads/1/3/0/6/130639822/8298963.pdf
    • http://alistairruane.com/uploads/1/3/0/3/130379625/raresona-zamuluki-lalagogufaxutew-pazox.pdf
    • http://totalimagepr.com/uploads/1/3/0/4/130483368/bemula_vagefoj_lelimej.pdf
    • http://firerondackchairs.net/uploads/1/3/1/0/131070602/5903441.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079f0.bin
217610e8886eaf5a4efb363ab7e2e2600f0528f7ae96913d5716a0feee346b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F0 7640 bytes
font_01_sfnt_off000097ca.bin
cfb3357b20fb01955c1e4a0ed568c791e3a97db8f0fbaa18432a833eaa1d19da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97CA 2828 bytes
font_02_sfnt_off0000a1bc.bin
e5c0e78609b4a70e87505bc4ea32526f3845da9f0d4452ac4bb4ccd620b0d64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1BC 16512 bytes

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