Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbea1b7f43bf5a5…

MALICIOUS

PDF

46.0 KB Created: 2020-04-11 00:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 2e207f3efdd7e006c832c1ab08223ee6 SHA-1: 87b7b0650ae463401a86f8ae02f69129d8960d7f SHA-256: 8bbea1b7f43bf5a5b65e96d7e2678c7793e89b44b65313ea322c8e9c875f9562
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to numeric-slugged PDF files, indicating a link farm for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful websites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://oakclass.com/uploads/1/3/1/0/131070723/131070723.html#testing+statistical+hypotheses+lehmann PDF link annotation
    • http://marychauvel.studio/uploads/1/3/0/3/130313809/3098749.pdfIn PDF document text
    • http://djlastminute.net/uploads/1/3/0/9/130969891/rudanarejujir-norora.pdfIn PDF document text
    • http://yasminleila.com/uploads/1/3/0/7/130739986/558ce1142.pdfIn PDF document text
    • http://mealplan4you.com/uploads/1/3/0/6/130620854/5017758.pdfIn PDF document text
    • http://everythingrealestate4u.com/uploads/1/3/0/5/130540501/2209457.pdfIn PDF document text
    • http://mirroryourbrilliance.com/uploads/1/3/1/4/131453033/lugikiletuj.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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

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_off00007d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D16 9536 bytes
SHA-256: f98a372d07378db692f4194fa31ce9f2594509c5e621fe6a33754f1b58977a64
font_01_sfnt_off0000a061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA061 2768 bytes
SHA-256: 11eff0542ee112a7a4f3d5fa86892f13f7f7c80edb17354215cea33bb7714487

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