Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41b21b26baffc5c…

MALICIOUS

PDF

35.7 KB Created: 2020-06-11 23:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68f4d9979851b0712bad3f88959192a7 SHA-1: 65ec879ae8465588f99fc481dfccfc48af0f57d5 SHA-256: f41b21b26baffc5cee2a9a4ff425d9f62f610736e4536750e92ff7d3434deb76
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'Tutorial unity3d bahasa indonesia' and the authoring application 'wkhtmltopdf', suggesting a lure document. The primary attack pattern involves directing users to a large farm of external URLs, likely for SEO poisoning or to distribute further malicious payloads. No scripts were extracted from this sample.

Heuristics 3

  • 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
  • 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://pentak.org/uploads/1/3/1/6/131606197/131606197.html#tutorial+unity3d+bahasa+indonesia
    • http://ns.cityofbeaufort.com/uploads/1/3/0/8/130814909/vixogubidakel-gulaguzowet-boped-xarigoju.pdf
    • http://70v1l.slpny.com/uploads/1/3/0/9/130968915/gakasotugon.pdf
    • http://hooshmandintelligence.com/uploads/1/3/0/2/130291433/wezifimimirud.pdf
    • http://aerialstudios.net/uploads/1/3/0/6/130621089/waridel-tudofunitixipov-mumelodobujijar.pdf
    • http://slfexhibition.com/uploads/1/3/0/4/130477039/9000201.pdf
    • http://miraas.xyz/uploads/1/3/0/6/130604361/588326.pdf
    • http://webdisk.147east.com.au/uploads/1/3/1/4/131409167/701dda8e234f0a4.pdf
    • http://mta-sts.ironcastlemarketing.com/uploads/1/3/0/8/130813654/1253784.pdf
    • https://xitaluwezu.files.wordpress.com/2020/06/34782459109.pdf
    • https://vipodujenij.files.wordpress.com/2020/06/95860281999.pdf
    • https://wunugevakel.files.wordpress.com/2020/06/27725219426.pdf
    • https://foxiwip.files.wordpress.com/2020/06/20904534142.pdf
    • https://nogitodidevu.files.wordpress.com/2020/06/lafiwemodilepinugosari.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f4d.bin
bf3bd3a8cdead1fab2dd5ef5c1bbd9312d3b171077f113426f2cf9f4bedd79d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 10484 bytes

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