Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0c1100238cc191…

MALICIOUS

PDF

43.5 KB Created: 2020-04-04 08:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31d2d2ee5c0e068c27535ca0207f12d7 SHA-1: 7057dac915754ed20f17b4df30f85b01dad1e4a7 SHA-256: af0c1100238cc1918b74c7fb52c00dae36d505568ddb2cd6b1b9b84259544f4d
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, http://sweetpeaboutique.store/uploads/1/3/0/5/130590305/130590305.html#expected+end+of+statement+vbscript+800a0401, suggests an attempt to exploit VBScript vulnerabilities. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of numerous external links indicates a likely attempt to redirect the user to malicious content or phishing pages.

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://sweetpeaboutique.store/uploads/1/3/0/5/130590305/130590305.html#expected+end+of+statement+vbscript+800a0401
    • http://mrgoebelsjs.com/uploads/1/3/0/6/130621205/lujujazover.pdf
    • http://valoratree.com/uploads/1/3/1/3/131398278/6338819.pdf
    • http://dollsbymarilyn.com/uploads/1/3/1/3/131398075/c4f1a9c7430d0cf.pdf
    • http://onegirlstakeonmoney.com/uploads/1/3/1/4/131453915/736621e.pdf
    • http://dlhp-solutions.com/uploads/1/3/0/6/130620605/sefonekenenefuz.pdf
    • http://gbcsolutionsgroup.com/uploads/1/3/1/3/131379605/1581726.pdf
    • http://prenatalmassageandcraniosacralmaui.com/uploads/1/3/0/3/130313252/dalutotiralufezuza.pdf
    • http://nomi-online.com/uploads/1/3/0/5/130544625/911894.pdf
    • http://harambeepasadiacic.com/uploads/1/3/1/4/131453188/3629972.pdf
    • http://fadjur.org/uploads/1/3/0/6/130603779/8264104.pdf
    • http://agapetruckingrvt.com/uploads/1/3/0/2/130288861/gokineki-suviwisikuxavil-sakunavuvidivu.pdf
    • http://western-union-nhantien-vn.online/uploads/1/3/0/3/130379246/nejux.pdf
    • http://williamjoconnor.com/uploads/1/3/0/7/130776239/lemom.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_off00006903.bin
5728ceb3d7ea7ef9fd6f0d3a9fd9463f177edf485d515f13634145acb914b879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6903 8872 bytes
font_01_sfnt_off00008b2e.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2E 16204 bytes

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