Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5e16688a7f409b…

MALICIOUS

PDF

43.7 KB Created: 2020-04-19 01:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1e6ff4f83fdd00c50216c31ed69828f SHA-1: c4db6218d42a334bffc01d25d28edbe62c0fa6cf SHA-256: 1a5e16688a7f409b33ff563fc0d9ff146f62c33f314e9d4333b64997454b2736
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files with numeric or generic slugs, indicative of a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains a URL that appears to be related to anemia classification, likely a lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jamiefehr.com/uploads/1/3/1/1/131163832/131163832.html#clasificacion+de+anemias+pdf+2018
    • http://whitelilycreations.com/uploads/1/3/0/7/130775698/gijelopuren-fewijemuzulam.pdf
    • http://artfromaveganheart.com/uploads/1/3/0/7/130738777/denolegat.pdf
    • http://angelfieldheirloomtomatoes.com/uploads/1/3/0/6/130620340/4324181.pdf
    • http://jechercheunmecanicien.com/uploads/1/3/0/7/130775016/c41531e24.pdf
    • http://nambemillhouse.com/uploads/1/3/1/4/131438709/jijaselezekevevokat.pdf
    • http://thecountryeggarizona.com/uploads/1/3/0/2/130288378/rokibeguzevik.pdf
    • http://emeraldtriangleherbalistguild.org/uploads/1/3/0/5/130588674/sipibuwixukezo_turefanog_duguzofizefap_finobetolabujok.pdf
    • http://magalec.com/uploads/1/3/0/5/130541552/2889210.pdf
    • http://estateplanninglawyerinhouston.com/uploads/1/3/0/5/130542852/tubamamorase_zagedig.pdf
    • http://l4ditems.com/uploads/1/3/0/6/130605332/wusolu.pdf
    • http://evilsupervillain.com/uploads/1/3/0/3/130323266/8010f1afa89317d.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_off000069fa.bin
6ddb32d3bfddadb74a01865ee5d1f81a1f0862b06e746d6d714dfd4f8d380418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FA 2484 bytes
font_01_sfnt_off00007499.bin
54caeea234b7808433cc0fefd567e003af918c6cb70f50582975053556d76abe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7499 9472 bytes
font_02_sfnt_off000095ff.bin
6dc6e07f93ae70488a19e8a398a1c6cda2f5723fc3d3cbe180c5afbb10c3611e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95FF 2864 bytes

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