Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d98609a5a0b753a…

MALICIOUS

PDF

45.1 KB Created: 2020-05-30 02:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d11c6f74d215b74d6b7c9654f61d3335 SHA-1: 0ca728a2b4ba7b9fc8a80d5ce82de3e0afbd41d2 SHA-256: 6d98609a5a0b753a1a827ded7fb3c27c4616f7ea5ada249a293b5e230e974079
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be directing users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://cashforjunksmartcars.com/uploads/1/3/1/6/131636824/131636824.html#alico+new+guide+mountaineering+hikin
    • http://skitterly.com/uploads/1/3/0/9/130969854/zefebaluxivox.pdf
    • http://chubbycheekreduction.com/uploads/1/3/0/6/130621908/solezaxefobota.pdf
    • http://eleftheriadoukallia.com/uploads/1/3/0/8/130813314/vosulojo-kodegizuku-meruneb.pdf
    • http://killinitcharters.com/uploads/1/3/0/6/130621068/pigobedegir.pdf
    • http://federalwaymassageschool.com/uploads/1/3/0/4/130436028/tovepijuvur.pdf
    • http://airmanua.com/uploads/1/3/0/7/130738740/4707159.pdf
    • http://storkshopli.com/uploads/1/3/0/4/130483047/muges-safopogofa.pdf
    • http://proyectagroupbo.com/uploads/1/3/0/5/130540789/13cd0b9ce74.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c56.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C56 1800 bytes
font_01_sfnt_off000084e2.bin
18dfbee072a3b7be8a9883a7a139f235509a59da29fd9b66bfebc3048c29af53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E2 10664 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.