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)
MD5: 2e207f3efdd7e006c832c1ab08223ee6 SHA-1: 87b7b0650ae463401a86f8ae02f69129d8960d7f SHA-256: 8bbea1b7f43bf5a5b65e96d7e2678c7793e89b44b65313ea322c8e9c875f9562
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. These links are likely intended to redirect users to malicious websites for content delivery or phishing. The ML classifier also strongly indicated maliciousness.

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
    • http://marychauvel.studio/uploads/1/3/0/3/130313809/3098749.pdf
    • http://djlastminute.net/uploads/1/3/0/9/130969891/rudanarejujir-norora.pdf
    • http://yasminleila.com/uploads/1/3/0/7/130739986/558ce1142.pdf
    • http://mealplan4you.com/uploads/1/3/0/6/130620854/5017758.pdf
    • http://everythingrealestate4u.com/uploads/1/3/0/5/130540501/2209457.pdf
    • http://mirroryourbrilliance.com/uploads/1/3/1/4/131453033/lugikiletuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d16.bin
f98a372d07378db692f4194fa31ce9f2594509c5e621fe6a33754f1b58977a64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D16 9536 bytes
font_01_sfnt_off0000a061.bin
11eff0542ee112a7a4f3d5fa86892f13f7f7c80edb17354215cea33bb7714487		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA061 2768 bytes

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