Malicious PDF — malware analysis report

Static analysis result for SHA-256 85025ba66f3058cd…

MALICIOUS

PDF

80.9 KB Created: 2020-05-31 03:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c5bfc8e1e2deffaa4bdb176d3c6ed70 SHA-1: 172153bb983180fea27c2977e4b2691064d87a6a SHA-256: 85025ba66f3058cdd9e85c0172542cbd5171ac2071e50d213023e07e45c09723
136 Risk Score

Malware Insights

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

The PDF document contains numerous external links, characteristic of a link farm designed to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to bypass gateway security. The presence of multiple unknown URLs suggests a distribution network for further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9661

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gratitude54.pleasingfood.com/uploads/1/3/0/5/130589058/130589058.html#banco+comafi+home+banking+personas+d
    • http://the-young-contrarian.com/uploads/1/3/0/8/130874122/163116.pdf
    • http://colmtobin.com/uploads/1/3/0/5/130544385/setiwatuzobu.pdf
    • http://vibrantbrunette.com/uploads/1/3/1/3/131381103/xarixevig.pdf
    • http://sweetwarsbakery.org/uploads/1/3/0/6/130604324/suketaxomoti.pdf
    • http://lekkersmikkelen.com/uploads/1/3/1/3/131383204/6295395.pdf
    • http://myprivatewebcams.com/uploads/1/3/1/3/131398515/7afb06c4ae4f095.pdf
    • http://stjohnash.org/uploads/1/3/0/2/130288962/13bb6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011010.bin
cbb2d8a0c704ea6bd1691659cb4a4e7a4a79914b0edbea1c48986e76b7b01de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 12072 bytes

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