Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d715a6a759c64b…

MALICIOUS

PDF

40.7 KB Created: 2020-04-01 20:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6966eb911bc82a8ebca83d043b24ec37 SHA-1: cb3da16326c10abc61937888f455ec914c7859ce SHA-256: 10d715a6a759c64b4e9f6d1cf950db20fc4bb70d398af59729a52321c4fbe0ce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded links, such as http://northtacomayoga.com/uploads/1/3/0/9/130969522/130969522.html#best+cookware+brands, suggest a link farm or SEO manipulation tactic, likely intended to redirect users to malicious sites or host further payloads. No scripts were extracted from this sample.

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://northtacomayoga.com/uploads/1/3/0/9/130969522/130969522.html#best+cookware+brands
    • http://krt24.com/uploads/1/3/1/0/131070733/jajudarewalikoj-tuvavudoj.pdf
    • http://stasbags.art/uploads/1/3/0/3/130313252/0f93fdf946d.pdf
    • http://thevisualnarrative.com/uploads/1/3/0/6/130604269/wowefosorolexusudago.pdf
    • http://taconinjaadventure.com/uploads/1/3/1/4/131437435/9712528.pdf
    • http://ephysiciancy.com/uploads/1/3/0/2/130287727/700012.pdf
    • http://newhopemanagement.net/uploads/1/3/0/5/130551054/305442f6.pdf
    • http://leelastuepfertportfolio.com/uploads/1/3/0/5/130551957/sojusorero.pdf
    • http://legacyfarmsllc.net/uploads/1/3/0/7/130738884/zaxej.pdf
    • http://medicareandretire.com/uploads/1/3/0/5/130551124/murakasuguvozuwe.pdf
    • http://holidayinharris.com/uploads/1/3/0/6/130621158/xixoxapiwafesamikutu.pdf
    • http://sportssuperfoodnutrition.com/uploads/1/3/0/9/130969896/3985764.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_off000076e1.bin
fff47759ca9a068d32635e1a89435e813c2ea6f40191788ab3e9612bbd808126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E1 7624 bytes

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