Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ef165c0a92c534…

MALICIOUS

PDF

30.2 KB Created: 2020-06-20 07:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 439a41335a40fc42f82d8b4a2488c5d4 SHA-1: 611d4a3bfe3c1ce12dac0c3c7c06637079c8733d SHA-256: 03ef165c0a92c534c745ae947186ce823c238e19dd49d6351fcf3b614b2b9264
96 Risk Score

Malware Insights

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

This PDF document is designed to appear as a "2006 subaru owners manual" but contains a large number of embedded links to external websites, forming a link farm. The primary heuristic indicates a "PDF_SEO_LINK_FARM" with 16 external PDF links, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://disacorp.com/uploads/1/3/0/8/130874232/130874232.html#2006+subaru+owners+manual
    • http://hearts-united-foundation.com/uploads/1/3/1/3/131381166/dowev_sasozizu.pdf
    • http://mail.maureenkarlstad.com/uploads/1/3/0/8/130874480/b0f7edc1db2.pdf
    • http://catedraldaesperanca.com/uploads/1/3/0/4/130483270/nipamo-laxadu.pdf
    • http://giftedguidance.net/uploads/1/3/0/4/130435611/xopokag.pdf
    • http://mail.vaporhauschicago.com/uploads/1/3/0/6/130603741/8758703.pdf
    • http://prosperment.com/uploads/1/3/1/4/131406560/bapuzibojusep_gufad.pdf
    • http://aladenet.org/uploads/1/3/0/6/130621980/mipegavat_xeromo_vemudok.pdf
    • http://noustix.com/uploads/1/3/1/3/131398425/6392819.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003dae.bin
a781b85d1a6e50c245d5e3319722fbcab21062ed3d2cd45766ad00f83cba6b59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3DAE 5152 bytes
font_01_sfnt_off00004f0c.bin
3bbe78bcc3c8c5d50c6a1340995c9a5f9b42027d0296c83975b5df2f989a6dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0C 8764 bytes

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