Malicious PDF — malware analysis report

Static analysis result for SHA-256 23793e23c3b0f4eb…

MALICIOUS

PDF

42.7 KB Created: 2020-06-03 14:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14f081945a8538d1e03433ab3cd15a6f SHA-1: 0a95c2154499af9b87e5989c6a4de88b27fd1da5 SHA-256: 23793e23c3b0f4eb7b6a5cee653449c6f50fe1f75575431c5757215075b45e00
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ML classifier strongly supports this assessment. The embedded URLs point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination or to host further malicious content. 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://wii-women-pilot.org/uploads/1/3/0/3/130313783/130313783.html#theatre+the+lively+art+9th+edition+d
    • http://santangelopainting.com/uploads/1/3/0/5/130590583/54a987d0.pdf
    • http://workplayplan.com/uploads/1/3/0/6/130605059/3710053.pdf
    • http://yukonbjj.com/uploads/1/3/0/6/130621959/wipekilitobusutebano.pdf
    • http://vomhausefaith.com/uploads/1/3/1/4/131437671/a25744c78a0787c.pdf
    • http://scottsdalexoticwraps.com/uploads/1/3/0/4/130483895/6667041.pdf
    • http://71-133-60-165.counterfitters.com/uploads/1/3/0/9/130968937/winikom.pdf
    • http://wii-women-pilot.org/uploads/1/3/0/3/130313783/terms.html
    • http://wii-women-pilot.org/uploads/1/3/0/3/130313783/dmca.html
    • http://wii-women-pilot.org/uploads/1/3/0/3/130313783/policy.html
    • https://jemuxotuwigi.files.wordpress.com/2020/05/lugore.pdf
    • https://samudazekami.files.wordpress.com/2020/05/jatixe.pdf
    • https://bafiretuv.files.wordpress.com/2020/06/pogutepunaritinupon.pdf
    • https://jevodixidene874494960.files.wordpress.com/2020/06/31645913441.pdf
    • https://tedutuvow.files.wordpress.com/2020/06/zijupuzog.pdf
    • https://kesakede.files.wordpress.com/2020/06/duxogobopasadexiwuse.pdf
    • https://xonikamuti.files.wordpress.com/2020/06/kozejijopajun.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065cc.bin
ddb7add8a99661f7dd1d9198064babd70e584cf6a21a01b49fd99957fc71fb1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CC 10780 bytes
font_01_sfnt_off00008972.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8972 16204 bytes

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