Malicious PDF — malware analysis report

Static analysis result for SHA-256 84587f399add3798…

MALICIOUS

PDF

43.1 KB Created: 2020-04-04 13:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 84457a115ef23a8eea7a5a1c8291610a SHA-1: 3c741892a7efb0b5d9e921e573d20fd260d1e947 SHA-256: 84587f399add3798d39bd70a7939544dafc5b7f154369181fcbc25afc69ab04e
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine ranking for malicious sites. No scripts were extracted, but the PDF structure and numerous external links suggest a malicious intent to redirect the user to potentially harmful content.

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://integral2030.org/uploads/1/3/0/7/130739153/130739153.html#que+es+un+mapa+mental+para+ni%C3%B1os+de+quinto+grado PDF link annotation
    • http://docfourlife.com/uploads/1/3/1/4/131437666/8414502.pdfIn PDF document text
    • http://treasurecoastultrasound.com/uploads/1/3/0/5/130590555/letiza_woselawam_kozaxexuxiganu_regesu.pdfIn PDF document text
    • http://doctorbrasher.com/uploads/1/3/0/5/130590588/a49aa3860a0d.pdfIn PDF document text
    • http://daniele-fleursdebach.fr/uploads/1/3/1/4/131483006/4866450.pdfIn PDF document text
    • http://familymarkets.org/uploads/1/3/0/9/130969922/1344488.pdfIn PDF document text
    • http://laent.org/uploads/1/3/1/0/131069893/8e82004fbad.pdfIn PDF document text
    • http://fishordiecharters.com/uploads/1/3/0/7/130775286/9fb2b0.pdfIn PDF document text
    • http://house-2homeinspections.com/uploads/1/3/0/4/130435922/4c971f.pdfIn PDF document text
    • http://mcginleymountainhome.com/uploads/1/3/0/4/130483499/penurexubebibow_mimudix_sawox_xonisupomag.pdfIn PDF document text
    • http://natuurcandles.com/uploads/1/3/0/7/130739383/26550d77fb6700.pdfIn PDF document text
    • http://shopbluebridge.com/uploads/1/3/0/2/130288534/tizofipetabax-rimefozowe-badelutogovibix-demox.pdfIn PDF document text
    • http://impactlifecoaches.com/uploads/1/3/1/4/131453630/562e0c465c20ec.pdfIn PDF document text
    • http://alsinc.net/uploads/1/3/0/5/130551864/3619198.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7341 2008 bytes
SHA-256: 887f302533a294d63c033f0828492d7658a9d17f775992f408881f7845df32c9
font_01_sfnt_off00007c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5D 8912 bytes
SHA-256: 241b0799cde2be5e07979b8fd8ab066c2aede86b78e402a26757e64cbc744268