Malicious PDF — malware analysis report

Static analysis result for SHA-256 027eb7daff3dd674…

MALICIOUS

PDF

43.6 KB Created: 2020-04-13 19:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a4dbe416c6ba5e4b6fde91e65dfa41f7 SHA-1: b5fb9df57d94cb7ff6a82cf5968836c2b5e8cc08 SHA-256: 027eb7daff3dd67465017c5abf3dc89220df6c885e12dc1d1858aa9ab120039c
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to PDF files hosted on unrelated domains, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards a campaign aiming to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oakclass.com/uploads/1/3/0/2/130271116/130271116.html#african+wild+dog+facts+information
    • http://lclreporter.com/uploads/1/3/0/4/130491418/sojepomofuzisugir.pdf
    • http://548sunnyvaledr.com/uploads/1/3/0/3/130379485/zatukusuwesasoroje.pdf
    • http://deliverfood.online/uploads/1/3/0/6/130639370/4143728.pdf
    • http://frameplug.com/uploads/1/3/0/7/130739182/wamemelodixovu.pdf
    • http://riveracresairport.com/uploads/1/3/0/8/130874179/5ef52ea19d.pdf
    • http://easttexasdoula.com/uploads/1/3/0/6/130621654/regomupomowepoze.pdf
    • http://thecheapdatesband.com/uploads/1/3/1/3/131381677/8f8bc2e4.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_off00008163.bin
4d5c5a301ed9f93e8581d8e6fdae874faf519d22651e165a9b7db9e18b89b45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8163 8360 bytes

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