Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5245fa4d10545e…

MALICIOUS

PDF

34.0 KB Created: 2020-05-18 06:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ad61fa02c6403ac78edcebb1509ba55 SHA-1: 5f9da6930201b64e6eacc4b8f0a7cb2c979e746f SHA-256: 0a5245fa4d10545e4fbfce78286f18d71088ef1fc2ffdcaaec8a5e3b04f403e7
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, contains references to 'clipboard history android app' and includes numerous URLs that appear to be part of a SEO spam or redirection scheme. No scripts were extracted, but the ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://graceangracerentals.com/uploads/1/3/0/7/130740017/130740017.html#clipboard+history+android+app
    • http://leregoleditozzimagazine.com/uploads/1/3/0/6/130603815/ee16174ef9e.pdf
    • http://drmindylais.com/uploads/1/3/1/4/131407504/fapuresoze.pdf
    • http://ruffeathers.com/uploads/1/3/0/5/130589124/c05221e.pdf
    • http://stuccotampa.com/uploads/1/3/0/6/130604884/tafibenur_fuwez.pdf
    • http://skillcraftdefense.com/uploads/1/3/0/7/130775278/motofugelo-mowazedera-ruxesobasa-nizupu.pdf
    • http://summerlolitamyers.com/uploads/1/3/1/6/131637240/vagenubu.pdf
    • http://bigislandcottage.net/uploads/1/3/0/6/130604729/9d7f83c9.pdf
    • http://vishuddi.com/uploads/1/3/1/3/131384771/deruvo-vupesekeferu-puvako-wapulabesirosot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059e6.bin
4373af00fc21d61cb105669be993cb2d36b6f2f7f39a5622c2a45a1a793fda56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E6 10368 bytes

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