Malicious PDF — malware analysis report

Static analysis result for SHA-256 8974d90d73357723…

MALICIOUS

PDF

32.1 KB Created: 2020-05-28 02:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 8d1ea6a32839639c43cc4ae6954b65fc SHA-1: f14b31caf5d2a2d96ef1e60ef3bf5c7599f735e4 SHA-256: 8974d90d73357723895dddb82943c05d42b0d22ffaa5dcc2a2b9aa5d605446c3
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, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content across multiple sites. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://alchemycorals.com/uploads/1/3/0/6/130639453/130639453.html#estadistica+en+los+negocios+ken+blac PDF link annotation
    • http://themusicdepotcanada.com/uploads/1/3/0/5/130543468/6461427.pdfIn PDF document text
    • http://erictharris.com/uploads/1/3/0/7/130776485/noguzijexixotumem.pdfIn PDF document text
    • http://beatysoberhouse.com/uploads/1/3/1/4/131407021/bamefujuduvarelites.pdfIn PDF document text
    • http://wecleaneverything.org/uploads/1/3/0/2/130288762/dadigi_gazop_xomudufob_walilatujodumar.pdfIn PDF document text
    • http://sidelogic.net/uploads/1/3/1/6/131637780/bavawolidipir.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

Related samples 3

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000500a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x500A 11040 bytes
SHA-256: e5369c872fbbde42f84f8bae2cdd2747b0a95c831e2cf8504c3e424aa9336924

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