Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c94c627f1102c2…

MALICIOUS

PDF

33.7 KB Created: 2020-04-17 12:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 3bd12f1eecf90dca87f2943cb378cdb4 SHA-1: aeb0fdcc628d3cfebd1d926879f6ba2ca1346513 SHA-256: f9c94c627f1102c2826a6bf27918d4c3c4528d37a77641139c807a9611ccfffe
136 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566 Phishing

The PDF file contains a significant number of external links, many of which point to seemingly unrelated PDF documents hosted on various domains. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates that the document's content likely prompts the user to install a browser extension or update. This, combined with the numerous external links, suggests a social-engineering attack aimed at tricking the user into downloading and executing malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://atlas-constructionltd.org/uploads/1/3/0/2/130289508/130289508.html#buy+nursing+uniforms+online+canada PDF link annotation
    • http://smartchemistrytutoring.com/uploads/1/3/0/4/130435511/xedukag-gowirika-puxofa-lajilejo.pdfIn PDF document text
    • http://socialsolutionpro.com/uploads/1/3/1/4/131482962/kixilijonagofi.pdfIn PDF document text
    • http://sawyerboone.com/uploads/1/3/0/4/130483678/gufulutimumodogonixa.pdfIn PDF document text
    • http://cindyliudesigns.com/uploads/1/3/1/3/131383694/a5a79e87c72d.pdfIn PDF document text
    • http://fadfreerd.com/uploads/1/3/0/4/130483498/d172b9ca.pdfIn 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

Related samples 8

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_off0000595a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x595A 9160 bytes
SHA-256: 5b371726655c85e25b63128b10192af33f8db6750dda6a9861d377253981eec9

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