Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c900e908522811…

MALICIOUS

PDF

43.2 KB Created: 2020-04-07 21:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1948986fc9d82945cfc4a59f2213f98a SHA-1: da20b69c9ef29c9276c341c14a810560c379969d SHA-256: 37c900e9085228111cf77621922f56c6b85ea3212f406c1ffae343ea976a3424
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains a large number of external links, indicating it functions as a link farm. The primary purpose appears to be directing users to a multitude of other PDF documents hosted on various domains, likely for SEO manipulation or to serve as a distribution point for further malicious content. No scripts were extracted, and the document body is heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://harvestjars.com/uploads/1/3/0/2/130291463/130291463.html#free+wifi+ip+freebox+inconnue
    • http://steveblacksmobile.com/uploads/1/3/1/4/131407351/899781.pdf
    • http://manyaralakeview.com/uploads/1/3/1/3/131382808/pizatolel_vuduvifinamab.pdf
    • http://safesontario.com/uploads/1/3/0/6/130620840/3748876e873.pdf
    • http://twenty5ive8ight.com/uploads/1/3/0/6/130620868/c474a29d74ee.pdf
    • http://herhomedesignshop.com/uploads/1/3/0/6/130603683/bexavu_wopimakanutijuv_silexizuzekube.pdf
    • http://governyourlife.com/uploads/1/3/0/3/130313037/pagaxuxuvajajex.pdf
    • http://myfishingcharterguyana.com/uploads/1/3/1/4/131407324/pujodona-sipazet-jukukawawive-xinuf.pdf
    • http://acollectorsdream.com/uploads/1/3/0/9/130969953/wakevilab.pdf
    • http://nicewayco.com/uploads/1/3/0/2/130287808/c70a6c.pdf
    • http://mesonelbomba.com/uploads/1/3/1/3/131378840/3666628.pdf
    • http://studiogiurisprudenzatorinese.com/uploads/1/3/0/5/130589338/jebuvij.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b7.bin
f7dafe7492b02633995c4df04556c7ec61b6dc50a611b3596281dc47c7c19676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B7 9404 bytes
font_01_sfnt_off00008969.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8969 16036 bytes

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