Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a04fdab5f2825d2…

MALICIOUS

PDF

45.5 KB Created: 2020-04-02 04:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1c7bfff29c50b861d8e07d0e5ac5ece4 SHA-1: 9ba0f8d2aeec65d7f32593435a41bf1c2f3aa67e SHA-256: 2a04fdab5f2825d2d98352b96ab531c5870c7184eceabb1aeb0b02ae1f3e6ff0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains a URL that mirrors the structure of many other extracted URLs, suggesting a coordinated effort to direct users to external content. The primary purpose appears to be SEO manipulation or the distribution of further malicious payloads via these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://stokesed508webpage.com/uploads/1/3/1/3/131383998/131383998.html#como+hacer+una+introduccion+para+un+portafolio+de+matematicas
    • http://hbmertz.com/uploads/1/3/0/6/130605196/23d5fb4e.pdf
    • http://biblebaptistpreschool.com/uploads/1/3/0/2/130289755/wikefumojagodu-kisadigen-zemasavige-lilevezisuf.pdf
    • http://hrhfilms.com/uploads/1/3/0/4/130477176/jewixi.pdf
    • http://redoattfoda.com/uploads/1/3/0/8/130873954/jupimavedur.pdf
    • http://cliffparrishhvac.com/uploads/1/3/0/5/130588928/gafikibat-nosazatuwe.pdf
    • http://mpcaa.net/uploads/1/3/0/7/130775118/bolanixiv.pdf
    • http://mykayscreations.com/uploads/1/3/0/4/130436006/7135910.pdf
    • http://coburgantique.com/uploads/1/3/0/5/130550700/9884799.pdf
    • http://lawenforcement.services/uploads/1/3/0/3/130312914/nurapi_pifitatidepebi.pdf
    • http://myblueskyreiki.com/uploads/1/3/1/3/131380427/wabesog.pdf
    • http://mainesistersaccessories.com/uploads/1/3/1/4/131438109/5035490.pdf
    • http://ahihomeinspectionsincjfksmechanicalshavc.net/uploads/1/3/0/5/130540814/gexuwewotuwakiwire.pdf
    • http://eco-poet.com/uploads/1/3/0/4/130488696/gosisosipiles.pdf
    • http://pascale-online.com/uploads/1/3/0/6/130604026/2788977.pdf
    • http://bhpcd.org/uploads/1/3/0/5/130539412/a5ce9db44.pdf
    • http://ridgenapaautoparts.com/uploads/1/3/0/5/130588625/riwusukij.pdf
    • http://thefencingmaestro.com/uploads/1/3/1/0/131069923/331550058e8.pdf
    • http://eldoradopasadena.com/uploads/1/3/1/3/131384115/xasubopojatu.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_off0000864d.bin
c97f3ee07b9ec149fe36c51f4812e9acec8f0e14157271b63d4400139e39989d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864D 8812 bytes

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