Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d06b183450b4b1…

MALICIOUS

PDF

69.5 KB Created: 2020-04-21 14:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e8bd2428139c1739c826bc2662e64f96 SHA-1: 7b5a53ef58348048dcf5e30b27dce895e87f668a SHA-256: e1d06b183450b4b1bde8b77c876f2f9c9c78c495b72e011477e9f091255f5f1b
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains a reference to 'flight of the bumblebee sheet music imslp' and a URL that matches this theme. This suggests a lure to trick users into clicking the link, potentially leading to further malicious content or downloads. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://alignedinlife.com/uploads/1/3/1/4/131453509/131453509.html#flight+of+the+bumblebee+sheet+music+imslp
    • http://krei-energy.com/uploads/1/3/0/7/130739875/e0d6b6e9ea44.pdf
    • http://htbordercollies.com/uploads/1/3/1/4/131407572/1487567.pdf
    • http://commaxinvestmentgroup.com/uploads/1/3/1/3/131381142/9245537.pdf
    • http://cooksrestoration.com/uploads/1/3/0/3/130313015/d41a886.pdf
    • http://makeshopsocial.org/uploads/1/3/1/3/131379444/364b58c5fcd4.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_off0000e80f.bin
e090b8762ec17a6386af529d5295aed66c5c78a8c6f39de8e6ffe735ecc9ec5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 9484 bytes

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