Malicious PDF — malware analysis report

Static analysis result for SHA-256 1442b5580c4a12f1…

MALICIOUS

PDF

40.5 KB Created: 2020-04-20 08:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 142b1c74e96d60d1d3b35afbd963f9df SHA-1: 4de12cf3a6a73c8edfdf873c0f9e309c7490e152 SHA-256: 1442b5580c4a12f1be6e7de4b8e6eb42bfbf8638116c6095bf1aaa1a3d45238b
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The embedded URLs point to various domains, many of which appear to be part of this link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://machoco.com/uploads/1/3/0/5/130540700/130540700.html#how+to+perform+spermatic+cord+block
    • http://jwcleaningteam.net/uploads/1/3/0/3/130313252/4e7bfb2.pdf
    • http://amadispanaderia.com/uploads/1/3/0/7/130738497/2480488.pdf
    • http://pixelobet.com/uploads/1/3/0/5/130588289/gogazofebil_kaxigi_jukirusino_nusonomomuw.pdf
    • http://nareshgambhir.com/uploads/1/3/0/9/130969414/tepanojemog_totisivewij.pdf
    • http://stillthegoodguys.com/uploads/1/3/1/4/131438071/57ae9.pdf
    • http://thesocialround.com/uploads/1/3/0/3/130323216/4197563.pdf
    • http://escholarship
    • 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_off00007688.bin
e320c7ca3f31876d74a7609f9067cbbdce3e8989dbd462bae2cd14cb2822d39d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7688 8232 bytes

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