Malicious PDF — malware analysis report

Static analysis result for SHA-256 836e737b27f85c90…

MALICIOUS

PDF

51.5 KB Created: 2020-03-29 13:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 05f81ebc76803883a31dbdbb9aae7cd5 SHA-1: 2daed8bc48e78507097de80a192028c075aa2aa8 SHA-256: 836e737b27f85c90c61334ba17543ccbe29c2ebf0ef31e60545170175d4ccf3a
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links to other PDF files hosted on various domains, indicating a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to quadratic equations, likely a lure to disguise the malicious intent.

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://bloddiagnostik.com/uploads/1/3/0/3/130313426/130313426.html#ecuaciones+de+segundo+grado+ejercicios+resueltos+por+factorizacion
    • http://industriyamarikina.com/uploads/1/3/0/6/130621182/9063253.pdf
    • http://jcshomes.com/uploads/1/3/0/6/130604416/jeniro.pdf
    • http://myhealthcopenhagen.com/uploads/1/3/0/5/130545249/xafajozopet.pdf
    • http://rodasphotography.net/uploads/1/3/0/8/130814735/7931579.pdf
    • http://creamcitymanagement.com/uploads/1/3/0/6/130620800/lojipima_tulav_vepib.pdf
    • http://iroquoiscountyscholarshipgolfouting.com/uploads/1/3/0/3/130324207/3b55f50368e4.pdf
    • http://farlicity.net/uploads/1/3/0/4/130488542/tulep_nipasiliroxo.pdf
    • http://aussiehomeschooleureka.com/uploads/1/3/0/8/130813381/3d90403a49c.pdf
    • http://alchameystudiosalon.com/uploads/1/3/0/3/130323229/dunelidotojo-ruvokojab-vedirinomanod.pdf
    • http://restorativereiki.net/uploads/1/3/0/8/130814209/wazipawizat_movof_miwimuxifodefu.pdf
    • http://emilytiberio.com/uploads/1/3/0/8/130814529/6413667.pdf
    • http://simplifycoaching.net/uploads/1/3/0/4/130488322/bonasego_datixifalazarok_nofirelus.pdf
    • http://auroracinemaproduzioni.com/uploads/1/3/0/4/130488197/3837773.pdf
    • http://mixmatchsnackattack.net/uploads/1/3/0/2/130271148/bb5758419c14c.pdf
    • http://valleysweets.com/uploads/1/3/0/8/130814675/5481937.pdf
    • http://alan-foote.com/uploads/1/3/0/7/130739027/danorew.pdf
    • http://gypsydharma.org/uploads/1/3/0/4/130488069/1328197.pdf
    • http://gaithersburgcarpetcleaning.biz/uploads/1/3/0/6/130604240/3850024.pdf
    • http://seeking-hope.com/uploads/1/3/0/8/130814342/wajiseta.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_off00007957.bin
bf58f9bc87babf45bcd8223b99398e9ae31255c534f42feb8536b6dd0e5d43f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7957 9696 bytes
font_01_sfnt_off00009c76.bin
9f6f5029c0ac59b681ced22df2fa85f8840e0e79325c6959571b7f832c1d4723		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C76 3088 bytes
font_02_sfnt_off0000a74f.bin
0e443917a2437929be24f23e56d4f306684085e1e86450cb9dd6088f4af16c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA74F 16248 bytes

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