Malicious PDF — malware analysis report

Static analysis result for SHA-256 68258017de391fcb…

MALICIOUS

PDF

29.5 KB Created: 2020-05-15 07:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2bfa241d1131d168f52dab57972fda8 SHA-1: b8c7b3ff32c1c2cec6e41a705aba69c22ec0dd60 SHA-256: 68258017de391fcba4e04d12491832d28149fcf0d8cde85b9dd1bbbcabe0c2c7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern appears to be SEO link farming or redirecting users to potentially malicious content hosted on numerous domains. No scripts were extracted, but the embedded URLs are the main indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pbjconstructionllc.com/uploads/1/3/0/5/130544243/130544243.html#arab+song+videos+free+s
    • http://makeupbytinsley.com/uploads/1/3/1/8/131856005/8112654.pdf
    • http://thorvacs.ca/uploads/1/3/0/7/130775680/1526622.pdf
    • http://sibeerian.com/uploads/1/3/0/7/130775537/zegupifod_jixarexobada_japew.pdf
    • http://agaperadioonline.org/uploads/1/3/0/2/130270911/9182951.pdf
    • http://toprewardsite.com/uploads/1/3/0/8/130814286/5029678.pdf
    • http://plussizebridaldressesma.com/uploads/1/3/0/3/130323206/4b8f1e5820809.pdf
    • http://interfaithdialogue.us/uploads/1/3/1/1/131163908/00c918c.pdf
    • http://rscleaningservices.net/uploads/1/3/0/2/130272470/0687b8e.pdf
    • http://michaelsclassicclivias.com/uploads/1/3/1/3/131379584/wamamax_lanon_nipuvorodu.pdf
    • http://jimmyballen.com/uploads/1/3/1/4/131482887/sasutukegot.pdf
    • http://ttlivestockco.com/uploads/1/3/0/7/130740200/dopabatekawojosufemi.pdf
    • http://mrswoodworth.com/uploads/1/3/0/8/130874326/bdbae056684a5e.pdf
    • http://thekeytoheaven.com/uploads/1/3/0/6/130604505/ab2931f.pdf
    • http://mipalmi.com/uploads/1/3/1/3/131383854/dozerozoroxono.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d2d.bin
6b5d5a5a24ee0ebd93a0de11eb9bc36b4a8a22787c160ef0b4c0c733eb591470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D2D 8924 bytes

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