Malicious PDF — malware analysis report

Static analysis result for SHA-256 6834aeedc53b348d…

MALICIOUS

PDF

36.7 KB Created: 2020-04-09 03:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a1559199deba9cfa2f9cdb0679314488 SHA-1: 4baf83ba0885167a5ec39dab9da81884068d0fc8 SHA-256: 6834aeedc53b348d863b225d8a50faae03574e6a5c29efca14cbae91492fb623
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external PDF documents hosted on a variety of domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a coordinated effort to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://embracenfglife.com/uploads/1/3/1/3/131380433/131380433.html#propiedades+de+los+no+metales
    • http://trainergrub.com/uploads/1/3/0/8/130813859/xutemelelaz.pdf
    • http://pricedestroyer.com/uploads/1/3/0/7/130738607/96dc8a.pdf
    • http://poppachips.com/uploads/1/3/1/4/131408298/3631070.pdf
    • http://jeleve.net/uploads/1/3/1/0/131071249/4c7160567326.pdf
    • http://stoneddreams.net/uploads/1/3/0/2/130271167/buzovijobov_wovid.pdf
    • http://my-cheap-sunglasses.com/uploads/1/3/0/9/130969220/1747148.pdf
    • http://kofc6065.org/uploads/1/3/0/6/130639807/5bc31f1baa622.pdf
    • http://cynthiarichardsforohio.org/uploads/1/3/1/4/131412713/82d46b5b2.pdf
    • http://uthell.com/uploads/1/3/1/4/131437225/95039c55f9562.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000668b.bin
f665efc0fac8dd25614adefe7aabca064c18fa89b622e4f09049bf1c55e85538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668B 8748 bytes

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