Malicious PDF — malware analysis report

Static analysis result for SHA-256 0918beb267710b5e…

MALICIOUS

PDF

25.7 KB Created: 2020-04-15 17:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 780f636691dc9eb3da15dd5882fc9c76 SHA-1: 5362e6c770460539737a287edfca289ac1731992 SHA-256: 0918beb267710b5ee3966899e2acc9507e6e8807d0ef7a55aaefa03c965d7c46
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or host malicious content. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes some of the URLs, reinforcing the link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fandomsasawayoflife.com/uploads/1/3/0/8/130814021/130814021.html#eclipse+neon+ee+version
    • http://lisagracecoaching.com/uploads/1/3/1/1/131163945/mexekotu.pdf
    • http://4lawsfamily.com/uploads/1/3/0/3/130324050/pidijobofiti-kelobopawipeweg.pdf
    • http://theeyeglassroom.com/uploads/1/3/1/1/131164437/lobisibagob-pekigoxoguvep-romokepefubi-lozilejus.pdf
    • http://lillysslimery.com/uploads/1/3/0/3/130313190/190172.pdf
    • http://canrea.org/uploads/1/3/0/4/130477755/kukarosi.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_off00004068.bin
0b5f893fb2bc5725b75587baa3e1983ddb5db89f60a29f42431d7237232353a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4068 6944 bytes

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