Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e3eead5baa5a36…

MALICIOUS

PDF

34.6 KB Created: 2020-04-15 16:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 796a6cd8fa24568e9d213cbdd4aff206 SHA-1: aaca6c6038217d995b084bce28e27f69b8f5f889 SHA-256: 06e3eead5baa5a36f360b0a5b3d290729f5197d514244a9f1385830f79bfa4aa
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which appear to be part of a link farm designed to host further malicious content. The document body, though heavily obfuscated, contains text suggesting it is a 'bill of sale template', a common lure for phishing. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF_SEO_LINK_FARM heuristics confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jamiefehr.com/uploads/1/3/0/6/130620508/130620508.html#general+bill+of+sale+template+pdf
    • http://comfortstylus.com/uploads/1/3/0/7/130739654/9171589.pdf
    • http://dragon-stuff.com/uploads/1/3/0/5/130539718/lipeguroforinerob.pdf
    • http://myartonanything.com/uploads/1/3/1/3/131383553/1955020.pdf
    • http://darciestevenson.com/uploads/1/3/0/4/130476503/vomojaga-somaguvun.pdf
    • http://nimbledevices.com/uploads/1/3/0/7/130740082/658ede407.pdf
    • http://screconcrete.com/uploads/1/3/0/6/130639786/2c68be4d7709.pdf
    • http://coremedicalassociates.com/uploads/1/3/0/5/130551505/sokefolo_xesuvo_gegisinit_jubomurapiz.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_off00005fef.bin
4f89ea0d3f2ed3d13b56550c2a2bb1664e54d175a0eb0900336fdf406838f4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEF 7920 bytes

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