Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc8bee391a74208…

MALICIOUS

PDF

41.5 KB Created: 2020-04-07 12:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 45231acd959fd9811709ef7466dbd02d SHA-1: d9abc8c5088adcbae802a5bf756b0391f7f712ad SHA-256: 0dc8bee391a742084b7f633001a6e6fd20098896dea7e28503b3caf0787bc1b3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to manipulate search engine results. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded URLs. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://jaycoprestige.com/uploads/1/3/0/5/130551659/130551659.html#planting+guide+florida
    • http://nctfconcealment.com/uploads/1/3/0/5/130544318/6181802.pdf
    • http://laurindajones.com/uploads/1/3/0/6/130621296/wigipuvonewovimezal.pdf
    • http://188prospectstreetu1.com/uploads/1/3/0/5/130590532/gopufijajusokivapifa.pdf
    • http://thelocalreview.org/uploads/1/3/0/8/130814279/207a0e0.pdf
    • http://gcharlieplumbing.com/uploads/1/3/0/7/130776587/2625612.pdf
    • http://clickingcanvases.com/uploads/1/3/1/4/131406939/90aca21.pdf
    • http://irs-g.org/uploads/1/3/0/8/130873781/gogeb.pdf
    • http://proscapelawnandsnow.com/uploads/1/3/0/6/130620556/wufojafuxo.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_off00007030.bin
5c6f71009161dc3777f4fc39e94eb3bea7eaf60e3b8d6add747952aa5336b7f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7030 8008 bytes
font_01_sfnt_off00008f48.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F48 1708 bytes

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