Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fe5fba7a753d4c…

MALICIOUS

PDF

43.8 KB Created: 2020-06-20 14:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 109f3496556b026fe82a0084af3077a6 SHA-1: 72673aedf09c552e3c9ed72235ec1221828f0562 SHA-256: e0fe5fba7a753d4ca1d2d758241517926f2d96cb39da25b1027513583be3be50
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to domains that appear to be part of a link farm or SEO spam operation. The document body, though partially corrupted, suggests a lure related to 'weight loss exercises'. The ML classifier strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://online-inkasso.de/uploads/1/3/1/4/131437546/131437546.html#best+muscle+exercises+for+weight+loss
    • http://dickenscarolersgr.com/uploads/1/3/0/5/130550711/zizixodotex-logawupexe.pdf
    • http://solesbeeco.com/uploads/1/3/0/4/130493389/vosevetibimajobekun.pdf
    • http://waystodogood.org/uploads/1/3/1/4/131411197/5937638.pdf
    • http://triunitymetaphysical.org/uploads/1/3/0/9/130969198/muzunela.pdf
    • http://olddogsreinetwork.com/uploads/1/3/0/3/130313605/3a6bafbab.pdf
    • http://betachy.net/uploads/1/3/1/4/131437294/bc6df14adf391.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f5f.bin
8fe33b62670f7fa15ba338cb464d55c57b8ac7f5dcf7ed0c47948ce7113ba666		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5F 5072 bytes
font_01_sfnt_off000080c3.bin
273b8811fea1d68ff2201541be61aed8d4b0e616ea7fa31498f1c03cb7091156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C3 10172 bytes

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