Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2d45e8acd5a5ee…

MALICIOUS

PDF

32.4 KB Created: 2020-04-11 08:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db0c70aad5584f1478e899c336712d2b SHA-1: df33afd9cb3b0934474625bb26336f6f951d1e58 SHA-256: 3f2d45e8acd5a5ee83044c0dd75846706a425838bed4ab2646b515f084a8adf5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links to various domains, identified as a PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body, though heavily corrupted, contains references to the book 'Tintinalli's emergency medicine' and several URLs, suggesting a lure to external content. The primary attack pattern appears to be a link farm designed to manipulate search engine results or redirect users to potentially malicious sites.

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://hotelvic-phase2-ko.devsite-1.com/uploads/1/3/1/3/131398324/131398324.html#tintinalli%27s+emergency+medicine+a+comprehensive+study+guide
    • http://pof-appcallservices.com/uploads/1/3/1/4/131437394/pifaguxusodixopowop.pdf
    • http://ostross.com/uploads/1/3/0/6/130639629/telonedab.pdf
    • http://venezioservices.com/uploads/1/3/1/4/131453985/ee99bfb89b74a.pdf
    • http://roaringnews.com/uploads/1/3/0/5/130588221/9402944.pdf
    • http://zakreative.net/uploads/1/3/0/8/130873715/9555809.pdf
    • http://manatonmakers.com/uploads/1/3/0/5/130551366/lofor.pdf
    • http://yuleetreeservice.com/uploads/1/3/0/7/130775056/kigawizirapiv.pdf
    • http://nycgymfinder.com/uploads/1/3/0/7/130775985/nejurajoj.pdf
    • http://ajanecole.com/uploads/1/3/0/6/130639658/diwozukus-bumebimetoze.pdf
    • http://uppityfox.com/uploads/1/3/1/0/131071183/e5fb91b99c.pdf
    • http://winfreyking2020.com/uploads/1/3/0/5/130590154/8379993.pdf
    • http://helpourplanetevolve.com/uploads/1/3/0/5/130588749/visizopipaxavekemol.pdf
    • http://daprayzerdesignllc.com/uploads/1/3/1/1/131164076/5d942c4f.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_off00005898.bin
e2cc4ae169133a3d3b3fb27c738fb207a62f46773e30db00b57eab31c3a64347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5898 7268 bytes

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