Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43c31d86fda9d1d…

MALICIOUS

PDF

36.7 KB Created: 2020-05-16 21:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 548260f849f8a0ae04fadcea762e2632 SHA-1: 1fbcaf7259846f4c7b3a1f70ce00444c4adc9743 SHA-256: a43c31d86fda9d1df3b96a1ecd9012b625da1182efe91c0b42100eaefca002c6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links, indicating an attempt to direct the user to external content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://shardexplorers.com/uploads/1/3/0/7/130776609/130776609.html#cricut+heat+transfer+vinyl+sheets PDF link annotation
    • http://photosbysarah.ca/uploads/1/3/0/6/130639406/e3fd43.pdfIn PDF document text
    • http://ellatainment.online/uploads/1/3/0/5/130542710/0bf62ce757fe381.pdfIn PDF document text
    • http://christophercameronstudios.com/uploads/1/3/0/2/130288722/fijidiliful.pdfIn PDF document text
    • http://rugbyid.com/uploads/1/3/1/3/131380606/1840158.pdfIn PDF document text
    • http://tuckersbarbecue.net/uploads/1/3/0/6/130621511/jogolirone.pdfIn PDF document text
    • http://ahsni.com/uploads/1/3/0/8/130874364/3625451.pdfIn PDF document text
    • http://lead180consulting.com/uploads/1/3/0/9/130969496/difiz.pdfIn PDF document text
    • http://premperfection.com/uploads/1/3/0/5/130543386/1945263.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 2

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_off00006516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6516 10368 bytes
SHA-256: 9c65a1b3e984f0f0770e1daa2e55d66963566bfced5ecee73a005f22ac1e7ed3

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