Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f0022dbc898e25…

MALICIOUS

PDF

37.7 KB Created: 2020-06-01 23:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b531b11a50c1fab99194ae6baa4dae02 SHA-1: 0c09494c83855d70098568e68d13fb125bf07834 SHA-256: b6f0022dbc898e25974558197c63758168943657a6af7b483ed617239b3e727b
92 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a large number of external links, characteristic of a link farm. The primary heuristic indicates the presence of a mass external PDF link farm, with the dominant host being imperialservicos.com. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its malicious nature. No scripts were extracted from this sample.

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://melvinmoremd.com/uploads/1/3/1/3/131398083/131398083.html#cuentos+para+bebes+en+el+vientre+gra
    • http://imperialservicos.com/uploads/1/3/1/3/131380901/duwumilebonexakikup.pdf
    • http://amarillolimo.net/uploads/1/3/0/8/130813948/ea371b6c5f2c8.pdf
    • http://faireunedonation.com/uploads/1/3/0/5/130543134/kiloxakixusom.pdf
    • http://osaapps.com/uploads/1/3/1/6/131606687/kisuwu.pdf
    • http://integrityvalue.net/uploads/1/3/0/3/130312926/4bc0d26f765d19.pdf
    • http://melvinmoremd.com/uploads/1/3/1/3/131398083/terms.html
    • http://melvinmoremd.com/uploads/1/3/1/3/131398083/dmca.html
    • http://melvinmoremd.com/uploads/1/3/1/3/131398083/policy.html
    • https://sikazagoze.files.wordpress.com/2020/05/pagawofirozugajo.pdf
    • https://rekujowaba.files.wordpress.com/2020/05/malewagerevafomana.pdf
    • https://jisabiwofif966812601.files.wordpress.com/2020/05/15544046354.pdf
    • https://giguzetefut.files.wordpress.com/2020/05/ruwazi.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_off000065f8.bin
eddcfdc63ecb73529034f1f0148a8fa2f26d58a8e37f72daf2937ca34c9fb24f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F8 10952 bytes

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