Malicious PDF — malware analysis report

Static analysis result for SHA-256 55664e0c2de8acce…

MALICIOUS

PDF

30.1 KB Created: 2020-04-13 06:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9d2618b5d9177f3b0cb3265304080316 SHA-1: e40db4a71bdac2d1ee3b0b693aee0c264018a49b SHA-256: 55664e0c2de8acce80fc91e918b0ba8609b0948718df0b2cf9544af1e8605fef
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, likely designed to drive traffic to malicious or low-quality content. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly flagged this PDF as malicious.

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://loren-brown.com/uploads/1/3/1/3/131398076/131398076.html#how+to+set+up+a+zenith+converter+box
    • http://vacationownershipnow.com/uploads/1/3/1/4/131438038/doxafe.pdf
    • http://thewhitealligator.com/uploads/1/3/1/3/131381243/majomisediguxulutej.pdf
    • http://dentaldivalicious.com/uploads/1/3/0/6/130605353/e7efbff784feda.pdf
    • http://teamkidshelpingkids.com/uploads/1/3/0/7/130738777/pebiwixejotad_xibabesuki_zexeni_vejib.pdf
    • http://webuycarsredbank.com/uploads/1/3/0/5/130544257/5307189.pdf
    • http://choiceforbristol.com/uploads/1/3/0/4/130435978/bfb7f7b4266.pdf
    • http://ultimatestriperguideservice.com/uploads/1/3/1/1/131163640/b3edbf8d.pdf
    • http://byvernawonderlust.com/uploads/1/3/0/7/130738831/lisijalix.pdf
    • http://makesemfrescura.com/uploads/1/3/0/2/130289254/lugegaj_gutuxitivatona_zabimolegage.pdf
    • http://jodiessex.net/uploads/1/3/1/4/131483061/kamanugifupilagome.pdf
    • http://advancedearlylearningcentre.com/uploads/1/3/0/6/130603891/gufawemolulokuko.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_off00005087.bin
ef947bcffd4db7be39c07b3eaa9f45d607ffe082d3a99f27c045a40decd1732d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5087 7104 bytes

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