Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65b552ae12d5408…

MALICIOUS

PDF

54.1 KB Created: 2020-04-15 06:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c8f80b7827a6ea25d1a7dd30855915f6 SHA-1: 2c21f83982d2ea5825e5fcd228a67a999e706b17 SHA-256: a65b552ae12d540821138c27b24f1c072e27c89919bd093f3bf129dfba8ca94b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to other PDF files hosted on various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body is heavily obfuscated and contains a URL that appears to be part of this link farm.

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://timeframingconsulting.com/uploads/1/3/0/5/130540645/130540645.html#que+es+agrobacterium+tumefaciens+pdf
    • http://craftier-you.com/uploads/1/3/1/4/131438268/1289344.pdf
    • http://ihapakistan.org/uploads/1/3/1/4/131406348/zorizirozivele-xilaz-dopajemagudigug-fomaputak.pdf
    • http://accessrealtyca.com/uploads/1/3/1/3/131384081/jogaf.pdf
    • http://loughermore.com/uploads/1/3/0/6/130639239/javemanixavulofipesi.pdf
    • http://issomechanics.com/uploads/1/3/1/4/131483053/4a80561a9daa7a.pdf
    • http://ottawaartisansguild.com/uploads/1/3/1/4/131408930/6e29803624d.pdf
    • http://eolefrance.com/uploads/1/3/0/3/130313135/914510.pdf
    • http://22apothecary.com/uploads/1/3/1/4/131454297/f848090b.pdf
    • http://eventipedia.com/uploads/1/3/1/4/131408838/8980055.pdf
    • http://northscottsdalevacationrentals.com/uploads/1/3/0/2/130289782/duwufobitabupi.pdf
    • http://pegasuswoodworking.com/uploads/1/3/0/7/130738681/regan.pdf
    • http://southcoastconstructioninc.com/uploads/1/3/0/6/130620834/lufur-gofufumubibo.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_off0000abc1.bin
b778588d2f80066cfd7fa9cc47b44538000979d9ba27b36acfe0b1dfe4b24176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABC1 8520 bytes

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