Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eeff2c4c3e39f03…

MALICIOUS

PDF

32.0 KB Created: 2020-04-18 04:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f33869bba750a0b6138ba4cf3ab2b772 SHA-1: 0f1842cab02391b611e3f53582f4de93bfee6576 SHA-256: 1eeff2c4c3e39f030f1a55a9bfa3deee54a23efc9eed6310fc16484c8060d9a2
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm designed to host malicious content or to obscure the true destination. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://conawaycoaching.com/uploads/1/3/0/6/130621413/130621413.html#flight+planning+worksheet
    • http://nacanation.com/uploads/1/3/0/5/130546333/7285584.pdf
    • http://petlifeprints.com/uploads/1/3/0/6/130604230/10f354ad634fb57.pdf
    • http://tietjen.us/uploads/1/3/1/3/131379919/4cf8fa.pdf
    • http://alisasapothecurious.com/uploads/1/3/0/3/130313309/zibovawer.pdf
    • http://kimerprops.com/uploads/1/3/0/6/130639593/zupowekalalerudevef.pdf
    • http://elyrialaw.net/uploads/1/3/0/9/130969385/jomamaguxajigajevo.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_off00005540.bin
a8a7a601b93094f087bc3f8f60a2219ac1487fedf61fedab266cc42930da5bde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5540 8136 bytes

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