Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdab532d21e8f5e…

MALICIOUS

PDF

51.6 KB Created: 2020-06-12 22:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce7f0bebada96f4cb5c311586f3fd748 SHA-1: 825fdf14590fdf9ecb881d13ec4f9a6f8fda42d7 SHA-256: 7fdab532d21e8f5e7c77cc92591966f36d83199300dd1c669e55e6859f87a587
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm, with the primary URL pointing to a page that appears to be a lure. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to direct users to a network of linked PDF files hosted on various domains. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://4gen4.org/uploads/1/3/0/5/130550743/130550743.html#d%25C3%25A9claration+d+intention+mariage+cath
    • http://deardrew318.com/uploads/1/3/1/4/131407398/b8c170bbf90b71b.pdf
    • http://partij-neeleman.nl/uploads/1/3/0/6/130604700/09a2ed662c866e7.pdf
    • http://development.friendsofadvantage.org/uploads/1/3/0/6/130604821/popalarusabes_vowifupi_xujowofewam_kugesoxi.pdf
    • http://macauleyconstruction.com/uploads/1/3/1/3/131379605/5ffba.pdf
    • http://bir-limited.com/uploads/1/3/0/7/130775495/4473445.pdf
    • http://carewaxcompany.com/uploads/1/3/1/3/131382118/8763c70c334103e.pdf
    • http://recollectiveway.com/uploads/1/3/1/4/131406744/8292147.pdf
    • http://warrenstratton.com/uploads/1/3/1/0/131070356/ritinopuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bomovekuj340683747.files.wordpress.com/2020/06/kulonijixedinajeveloz.pdf
    • https://ligovub.files.wordpress.com/2020/06/nujafukobuziwobexe.pdf
    • https://komogepu.files.wordpress.com/2020/06/22302604459.pdf
    • https://beweramomuga.files.wordpress.com/2020/06/74249527007.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009184.bin
a51319dd99e83c2c60e0b7fca3225d911ad68a7ba1fda5c432b1b8f99285c2d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9184 15672 bytes

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