Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5382c4d9746ec3a…

MALICIOUS

PDF

43.7 KB Created: 2020-05-27 22:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: bbc7a3242d3b8ba5a79925c8a9cf6c41 SHA-1: decac4007c5325433685f013f0b5fa2dd7f829b8 SHA-256: f5382c4d9746ec3a33f0e88dfb05df597106f464a3beceac99e6c6c496c9b48c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to various domains, a technique often used for SEO spam or to host malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, suggesting a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://8a7ufh.bdgct.com/uploads/1/3/0/7/130775198/130775198.html#accordion+sheet+music+how+to+read PDF link annotation
    • http://onmarkxp.com/uploads/1/3/1/3/131384289/6603017.pdfIn PDF document text
    • http://chelyroach.com/uploads/1/3/0/6/130621857/nedukusulo_lobilusizi_fikijegu.pdfIn PDF document text
    • http://muskokawaterfrontcottages.ca/uploads/1/3/0/6/130604423/011b7d.pdfIn PDF document text
    • http://sisterpcandles.co.uk/uploads/1/3/1/4/131437306/2486926.pdfIn PDF document text
    • http://coconutsbeachresorts.com/uploads/1/3/0/7/130738823/zozekekunumotej_bexusirumasike.pdfIn PDF document text
    • http://logonyx.com/uploads/1/3/1/6/131606550/3e4ec77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B33 10424 bytes
SHA-256: 5049a2e253e846b07454fc5485315f68be3a6e672a28dea67076756b2202a7ab
font_01_sfnt_off00008f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F09 16200 bytes
SHA-256: dcf5bf9068761a66a65f40ee5aed8df972f266ddb8aeda1fcf15af54b1a3ac9a

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