Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe6c3b04a52f8d3…

MALICIOUS

PDF

66.4 KB Created: 2020-03-29 01:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8813221ffdbc68b1b44695850e9a85a SHA-1: 137a6d2cc0211fc3c635eff7be86abfc2fcc5461 SHA-256: dbe6c3b04a52f8d3e71e4edf139e7bf6568242d09d6bea77db3f6943149acc55
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, with a high density of external URLs pointing to various domains. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous PDF_SEO_LINK_FARM heuristics indicates a deliberate attempt to create a network of linked documents. The primary attack pattern appears to be directing users to potentially malicious external sites through these links.

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://lastfrontiermusic.com/uploads/1/3/1/4/131407355/131407355.html#cutoff+for+skewness+and+kurtosis
    • http://affordablrides.net/uploads/1/3/0/8/130813945/8019376.pdf
    • http://myfourleaf.com/uploads/1/3/0/5/130590678/namirojopu.pdf
    • http://therightofway.org/uploads/1/3/0/2/130271211/8d9c22a8c05.pdf
    • http://www.everythingnotes.com/uploads/1/3/0/8/130813750/9730483.pdf
    • http://www.emilyhannacrane.com/uploads/1/3/0/6/130604694/viwavo_naxuwit_befolaku.pdf
    • http://rochestersportsfan.com/uploads/1/3/0/8/130814360/nomopa_dewamusefe_lalobuxo_visixegoja.pdf
    • http://precisionfabandrefurbishing.com/uploads/1/3/0/8/130873903/jazarasag.pdf
    • http://getinvolvedpa.com/uploads/1/3/0/4/130436162/1966995.pdf
    • http://mariewithak.com/uploads/1/3/0/9/130969800/didezum-reluxaxovu.pdf
    • http://livebake.com.au/uploads/1/3/0/9/130969477/12b91d88451739c.pdf
    • http://amberwaugaman.com/uploads/1/3/0/3/130313293/tixepajoruvelupe.pdf
    • http://www.lify.ca/uploads/1/3/0/9/130970012/fa095.pdf
    • http://mochasandjavas.net/uploads/1/3/0/6/130604213/78f5f9bcb.pdf
    • http://srzlending.com/uploads/1/3/1/1/131163660/6539724.pdf
    • http://sadfoxhack.com/uploads/1/3/0/6/130639573/fosot.pdf
    • http://footietransfers.com/uploads/1/3/0/5/130539696/5077360.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_off0000b054.bin
5078d48628ca1ff5537a576b1d9927f35a5f231807a196295a929619815155b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB054 10804 bytes
font_01_sfnt_off0000d77e.bin
1c7ff029bd9d9cebc57195580dfb72f3516e9cb9b77239a440803da7405f4a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD77E 3864 bytes
font_02_sfnt_off0000e49a.bin
72f6c90a647263d95168bc239a0e3a28e9b8c1aa6ce727412127635dc434b30a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 16060 bytes