Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb090dda88abc47…

MALICIOUS

PDF

35.3 KB Created: 2020-04-06 14:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14babd7dc5f50481c0d8bd4818fd0a6c SHA-1: 824c1831e8438650f10940f09cee2fcb18406ef9 SHA-256: 0eb090dda88abc4783657cab8d4cf997c3e9047a0ab0ad98494913fa86751fb6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains references to scripture and a PDF title, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown URLs supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mobilebeatzofcolorado.com/uploads/1/3/0/5/130541351/130541351.html#the+drama+of+scripture+pdf+act+2
    • http://sunlessbunnies.com/uploads/1/3/0/4/130483508/pefekokib_kikewuxawewojez_lefopasokaf.pdf
    • http://turbotechcomputers.net/uploads/1/3/1/4/131411857/5447654.pdf
    • http://japanthefilm.com/uploads/1/3/0/6/130639755/jutepuveguxa_bokevo_mivupunufa_pewobotebabupo.pdf
    • http://tyliddell.com/uploads/1/3/0/4/130475925/tepizibewi.pdf
    • http://setamortgage.com/uploads/1/3/0/4/130479210/nibunuton.pdf
    • http://bluebelltrail.com/uploads/1/3/1/4/131406449/f06a5d55.pdf
    • http://vietthy.com/uploads/1/3/0/5/130543093/3692093.pdf
    • http://sportsgrinding.com/uploads/1/3/0/4/130488417/vewezapefowate.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_off0000634a.bin
1a32f4334cef8f55333fe14443796644985e2e999d19825aa2d532982cfa00b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634A 7564 bytes

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