Malicious PDF — malware analysis report

Static analysis result for SHA-256 0333beb4307ace08…

MALICIOUS

PDF

36.5 KB Created: 2020-04-11 11:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8c7ef11c3bc3d0838904a8e1c662f623 SHA-1: c069e6269a9666bff9bc8c73e6f6ceed40fc7a56 SHA-256: 0333beb4307ace08458687d4181bfc52409500f8d66df7f3d8b27344193b4cc9
104 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 other PDF files with numeric slugs, indicating a link farm designed to host malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download' lure further supports a malicious intent. While no scripts were directly extracted, the structure suggests it's designed to facilitate the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://reboundat.com/uploads/1/3/0/4/130436171/130436171.html#avorion+ship+download
    • http://www.shows.sdfringe.org/uploads/1/3/1/3/131383982/denezupolajonawewo.pdf
    • http://ryan4iowa.com/uploads/1/3/0/5/130588377/mudijiwuruw.pdf
    • http://thejuicelife.store/uploads/1/3/1/4/131438190/97bda5.pdf
    • http://countrycomfortsmarket.com/uploads/1/3/0/6/130604281/difuf.pdf
    • http://jamescullity.com/uploads/1/3/1/0/131071159/c40f4f4.pdf
    • http://yokossushitx.com/uploads/1/3/0/4/130491752/dotefoxejar-somojovedanot-rukazokub-gonebez.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_off000065c9.bin
5c9ff0f7132ff5f3cdf8eca8dc3275f035282520e6bd61ce080e5cec7acbd45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C9 8480 bytes

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