Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf9a278da3caf2f…

MALICIOUS

PDF

32.0 KB Created: 2020-04-13 12:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ad4b082f91ae34ddba29f8595fbb7050 SHA-1: dcf106764fe7ebf577c3818a3f363a4b8e695080 SHA-256: edf9a278da3caf2fa986fcf83324a8321ca59ec11f7104c0b337cf106fb438ca
92 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains references to the URLs found in the heuristics, suggesting a lure to these external sites. The primary attack pattern appears to be SEO poisoning or phishing through a network of generated PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bluepalmdiscounts.com/uploads/1/3/0/5/130546432/130546432.html#siddur+tehillat+hashem+with+english+translation+pdf
    • http://northpointelodge.com/uploads/1/3/1/4/131483282/fosetenixuwur_jugot_jonewaxi_wutinuxe.pdf
    • http://mt31.fr/uploads/1/3/0/8/130814122/kugejopiwozoxu-sejojawet.pdf
    • http://nativeuniques.com/uploads/1/3/1/0/131070054/musoberi-xafunujerawo.pdf
    • http://backandbarberingstudio.ca/uploads/1/3/1/4/131437949/5121df172e3.pdf
    • http://pur7oil.com/uploads/1/3/0/8/130873818/mupipejituj.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_off000052a4.bin
29526bd3a9295b750542d00aefd3d316da8d4b111670dc8414207f0020648f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52A4 8160 bytes

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